hesitation

  1. A

    Vacuum line help

    I was wondering if anyone could help with where my vacuum lines need to go. I’m not sure why the vacuum diagram on my hood and many other forums I’ve looked at all confuse me. Partly because the previous owners had a really complicated way they put together all the vac lines. However I had...
  2. Piranahbite

    Throttle cut out at 3500 rpm

    Hey guys! Here with a question for yall, my 87 mustang runs like a champ, has a cam nock, but still runs great. A month or two ago, i was driving my car home and i laid the hammer down at a couple stop signs and at around 3000 rmp, the engine seemed to hit a rev limiter of some sorts, not...
  3. J

    Engine Hesitation, low power

    Please help! I have my dads 87 Mustang convertible that has been siting in my garage for several years. It broke my heart seeing it day after day not running. I finally had an opportunity to put some money into it. I did a five lug conversion, high performance shocks, plugs, wires, air...
  4. Motorsport71

    Fuel Recommended Carb Size?

    So I have an '85 Mustang GT with a 302 automatic and 3:73 gears. I replaced the engine with a roller motor I purchased from Blueprint Engines. The dyno sheet that came with the engine showed 9:1 compression, 308 hp and 344 ft/lb torque (at the crank). I put a Holley 4160 600cfm with vacuum...
  5. 9

    Engine Loud knocking/bang and hard starting/rough idle

    Hey everyone! First post here! I just got my 96GT back from up north, sitting around for about 7-8 years and no upkeep... Long story short, pops just left it covered outside in the DC weather... I'm starting to work on it again and am having a ton of issues as you can imagine. For starters, i'm...
  6. Motorsport71

    Fuel Trouble Diagnosing Hesitation from Timing OR Fuel Problem

    So i have installed a Blueprint Engine with 9:1 compression that dyno'ed 308 hp / 344 ft lbs torque. I installed a dual plane aluminum intake, a 1/2 phenolic spacer, a new Holley 4160 with vacuum secondary's, and an HEI distributor. For the drive line i have an AOD with 2400 stall torque...
  7. R

    Engine Remove the Idiot from the equation. Idle/hesitation issue.

    Well after hours and hours of following guides and videos and blah blah blah.. I finally found the issue of idle surge, hesitation under throttle, stumbling, bad mileage.. etc. Incorrect spark plug gap.. and since people are going to ask they were gaped at .035 not .055 and here is the reason...
  8. S

    Electrical 1995 Mustang GT slight hiccups/hesitation at around 2k rpm looking for a fix for the dreaded code 212

    Been working on this issue for months maybe even years now, it’s the same thing every test drive, it runs perfectly except for size varying hiccups and/or hesitations up at around 2k rpm, the code we’ve been receiving all this time has been code 212: loss of IDM (ignition diagnostic monitor)...
  9. N

    Need help w/ 2004 acceleration issue!

    Hi guys! my 2004 mustang has gradually been running rougher n rougher. I bought it about 6 months ago and have always noticed a kind of hesitation as if something was blocked or clogged. Changed The air filter 1st thing. Rough idle kinda shaky. But a couple days ago it started sputtering and...
  10. Xkuzme1

    Engine Engine gets hot and cuts out.

    New to me Car. Somewhat of a Frankenstein engine. Donor car was a 1993 Fox Body GT. The engine was rebuilt and upgraded with: Edelbrock victor Cobra intake Fly cut pistons Compcams 1.7 roller rockers Compcams 1pc hardened pushrods 130 amp alternator King cobra clutch X-303 cam (286 degrees...
  11. H

    Help! mass airflow sensor

    Well I don't really know if its the M.A.S. I will explain my problem now: When I accelerate the car start to hesitate like its low of fuel but only when its waiting at a red light, I guess that was the air filter so I change it for a new one, after I try the car without the air filter and works...
  12. A

    Engine Oil on Sparkplug Threads - Misfiring / Hesitation

    Hi everyone! This is my first post in this forum. I have been lurking and reading for a while and you have all helped me with my project. I was checking all my spark plugs the other day and on spark plug # 1 there was oil on the threads and build up on the electrode. I got worried and checked...
  13. 9

    Engine 1990 5.0 manual crank/no start

    When I first bought this car back in May 2015 it died on the freeway and had a similar situation. Put a new fuel pump, pressure regulator, filter in and it fixed the problem. Ever since it's had a weird hesitation under throttle and has bucked and hesitated especially on hills in a higher gear...
  14. FastRiz

    Wot Ok, But Hesitation Popping At Cruise Speed

    Hi everyone, I have a problem in which I've searched the forums and can't find one like the problem I'm experiencing. I can't figure it out and need the Forum expertise! I have a 91 5.0 with this specific problem 100% of the time hot or cold engine. When cruising at normal speed, hesitation...
  15. Joseph Tench

    Help Needed! 1994 Gt Car May Or May Not Bottom Out And Refuse Fuel.

    I have a 1994 Mustang GT that we traded a 98 f150 for. The car needed some work and had a surging idle and miss. The idle used to surge from 600 to 1000 and ran like sh*t. Since then we have cleaned and replaced the IAC valve, checked the plugs, plug wires, coil, and MAF. We then went to the...
  16. Nick Bos

    1970 Mustang Coupe-- Hesitation When Accelerating Question

    Hello all, I am new to forums in general and I thought the perfect time to join one is when I purchased a classic mustang. Anyways the problem I'm having is whenever I hit the gas hard, the car hesitates for about 2-3 seconds then finally revs up and goes. Its pretty bothersome and annoying...
  17. Y

    99 Gt Power/idle/rev/vibration Issues

    have a 99 by 4.6! First off when I start it it jumps to about 1500rpm then creeps down to 1000 and just hangs there. I put a new iac on and nothing. Second, while I'm driving around 40 mph my card starts vibrating I can feel it in the dash almost like its shuddering. If I floor it, I wants to go...
  18. O

    For Those Who Care

    For those who care to take a guess at the issue or have seen this issue before!- As warmer weather nears, I'll be fiddling with the car to get more info. Here are the specs/ concerns: -88 original 5.0 car Paxton novi 1000 supercharged with FMU - (No chip in ECU) -Car is still speed density...
    • OhNo- 5-0
    • Thread
    • fmu fuel management unit hesitation paxton rough running sputtering supercharged
    • Replies: 5
    • Forum: Fox 5.0 Mustang Tech
  19. S

    Engine Split Second Hesitation In 4.6l 98 Gt

    I have a 98 gt 4.6l. I have a momentary tick, hick up at any speed, What ever you want to call it.. There are no codes. Took it to a shop and he found no codes in the computer. He put it on all his testing equipment and found nothing. There is no pattern as to when it happens. It seems to maybe...
  20. M

    Engine 1989 Mustang 5.0 Full Throttle Drops Rpm Hesitation And Popping Noises

    Hello, I have a 1989 Foxbody Mustang 5.0 and whenever I give the car full throttle the engine starts to die. It makes popping noises under the hood and if i keep my foot pushed down on the throttle all the way the rpm drops and it just makes popping noises. I replaced the fuel filter and have...
    • mark32
    • Thread
    • 1989 1990 engine ford foxbody hesitation mustang no full throttle pinging popping
    • Replies: 13
    • Forum: Fox 5.0 Mustang Tech
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