idle issues

  1. T

    91 mustang idle surging

    I have a 91 mustang gt with a 93 motor in it with some work done to the motor from what I was told. They said it had a cam in it, 24 lb injectors, trickflow intake, 93 computer and bbk headers. There might be more but I'm not aware of but I sent it into a mechanic that had to use the 93 harness...
  2. Onesick99GT

    Low rpm stalling fix

    Hi, Wanted to share a piece of information regarding a fix for your vehicle that might be stalling when downshifting in lower rpms and gears. You might also have random idle issues or a non working speedometer. The part is called a output speed shaft sensor located on the drivers side of...
  3. Onesick99GT

    Speedometer Not Working Fix

    Hi, I wanted to share a piece of information for anyone that has a non working speedometer. My 99 mustang gt was without a working speedometer. Some of the issues experienced along with the part failure was stalling at low rpm and stalling when down shifting between gears at low speeds and...
  4. L

    Engine Rough Idle at Start, Possible CMCV Vacuum Leak

    Hi, I have a 2015 salvaged coyote in a 67 mustang running on the control pack. Everything is up and running, but it seems to have a rough idle at start. The idle continues to be rough until I rev the engine and it settles down to normal at around 1000rpm for about 5 seconds, after 5 seconds...
  5. C

    Stalling and idle issues

    I have an 08 mustang GT that has been modified with a e force blower, thumper cams and of course an aftermarket tune. The problem is when I am coming to a stop light the idle will go down to around 200 rpms then rev itself up to around 1300 or so. This will repeat until it either stalls or...
  6. N

    Engine 1987 LX 5.0 5 Speed - idle and . . .

    Hello all. This is my first post on this forum. I thank you in advance for the time and consideration you give to my issue. So, I just picked up a 1987 Ford Mustang LX 5.0, hatchback, 5 speed, all original, 100% stock, 27k miles. The thing looks like it was buried in an air tight time...
  7. Onesick99GT

    99 Mustang GT High Rev On Cold Start

    Hi Guys, Hopefully together we can figure out an issue I'm having with my mustang. I've identified the culprit but don't know how to fix it. My mustang will idle up around 2k rpm when the engine is cold. It bounces back and forth for a couple minutes slowly coming down to around 1200 rpm. My...
  8. N

    98 Mustang GT will not idle

    So my car (98 Mustang GT) for the longest time had problems running in general, and especially idling. The guy who did my exhaust cut the cats out for whatever reason without telling me So I've changed the IAC, the plugs, wires, fuel pump, and now injectors. The injectors makes the car RUN like...
  9. N

    Car doesn’t want to idle anymore after supercharger install

    So this past week I installed a Powerdyne supercharger into my 91 fox. Since I’ve got it installed, the car doesn’t want to idle anymore. If I get the car going 20+ it’s just fine and drives good and has great power, but as soon as I slow down to a stop the car starts to drop very low in rpm and...
  10. M

    High idle, big mystery

    (This is copypasta from AllFordMustangs. I promise I'm not a bot, I just posted there first) EDIT: This turned out to be the Idle Air Control Valve. I replaced it, problem solved. I have a 95 3.8, the other day I noticed all of a sudden it was idling high. I had been going down a 35 MPH hill...
  11. F

    Engine Need Help Tracking A Rough Idle On 2003 V6, Not Iac Valve.

    Need a second opinion on what the issue is. The car is a 2003 V6 mustang isn't anything fancy or have anything fancy on it. Spent last weekend trying to hunt down what I believed to be a vacuum leak. Turns out it wasnt a vaccum leak. Changed IACV after not being able to find any leaks...
  12. B

    2002 Gt Idle Issue

    I have a 2002 GT with full catless exhaust, CAI, Throttle Body, and Tune. When i first fire up my car it has a jumpy idle and has even died on me a couple of times; the wierd part is, is that I can go down the road for half a block and stop and the idle is perfectly fine. It only does it as soon...
  13. PJalbanesi

    Idle Surging

    I have a 1990 GT convertible and the idle was surging after a few minutes of running so I did some research and replaced the IAC valve and when I started the car it ran great for about 10 minutes then it started to surge again so I replaced the TPS sensor as well and adjusted it to about .96 and...