Muscular Mustangs - View Single Post - 1989 5.0 Cold ROUGH Idle
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post #2 of Old 12-04-2006, 07:33 PM
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Check for vacuum leaks around manifold. And Sometimes if your engine runs really rich when you first start it up it causes it to stumble or run rough. Air filter dirty? EGR valve dirty or not functioning. This is why I don't really like EFI because one symptom could be 1 of 100 things! Check PCV valve and spark arrestor (little filter under pcv), check TPS voltage, Check timing, Check fuel pressure replace fuel filter, Check cap, rotor, plugs, and wires, MAP sensor, Or you can try taking cables off battery for 30mins to reset computer. I did this on a buddies Stang and it fixed the problem. Dirty fuel injectors. This is a list of the things that I could remember from Snap-On ShopKey when I was looking for troubleshooting for my friends Mustang.

Bright Regetta Blue 1988 Mustang GT 5.0

White 1996 Mustang GT
*Flowmaster 40 series catback
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