Engine Rough idle, hit gas, stumbles and stalls

Ironjack-5.0

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May 21, 2021
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93 fox, stock block. Gt40 3 bar heads, trick flow street intake, long tubes, x-pipe, b-cam. 19lb injectors. Timing set to 14 BTDC, new plugs. TPS at 0.97. Car starts and idles good, as soon as I tap the gas and the rpms go back down, car starts to surge and then dies. Starts right back up and does the same thing...I’ve seen multiple threads of very similar issues, just no resolutions. I appreciate the help.
 
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Potomus Pete

Gretchen Whitmer is eating at me
Mar 7, 2019
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Fuel pressure, ignition module there is like ten culprits that need to be checked. Mine was never right till I got a throttle position sensor. After that all was pretty good. Then I got rebuilt four hole injectors, and now I have the new car ride. Lots of issues to go thru.
 

jrichker

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93 fox, stock block. Gt40 3 bar heads, trick flow street intake, long tubes, x-pipe, b-cam. 19lb injectors. Timing set to 14 BTDC, new plugs. TPS at 0.97. Car starts and idles good, as soon as I tap the gas and the rpms go back down, car starts to surge and then dies. Starts right back up and does the same thing...I’ve seen multiple threads of very similar issues, just no resolutions. I appreciate the help.
You guys with idle/stall problems could save a lot of time chasing your tails if you would go through the Surging Idle Checklist. Over 50 different people contributed information to it. The first two posts have all the fixes, and steps through the how to find and fix your idle problems without spending a lot of time and money. It includes how to dump the computer codes quickly and simply as one of the first steps. I continue to update it as more people post fixes or ask questions. You can post questions to that sticky and have your name and idle problem recognized. The guys with original problems and fixes get their posts added to the main fix. :D

It's free, I don't get anything for the use of it except knowing I helped a fellow Mustang enthusiast with his car. At last check, it had more than 250,000 hits, which indicates it does help fix idle problems quickly and inexpensively.
 
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Potomus Pete

Gretchen Whitmer is eating at me
Mar 7, 2019
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They are right IronJack. I went thru the list without skipping a step. While doing the list you might find other small issues. Early on I had to do the list as a fairly novice backyard mechanic. When your done you will feel like an expert as you get to know your car.
 
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