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Discussion Starter #1
I have a 94 tbird with the 3.8L. the motor was replaced about 40K ago and i am having a problem with it.

when it is cold the engine will randomly stall/rough idle when stopping or parked. when accelerating it runs great/fast great throtle responce.

when is it warm to hot the engine under mid to hard acceleration will sputter/lunge but will not stall/rough idle when stopping. it also has poor acceleration throtle responce.

i have tried cleaing the maf.

any suggestions

thanks
 

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Could be an IAC problem. Try cleaning it with oxygen sensor safe carb cleaner.
 

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nah, the IAC wouldn't effect it while he was driving. only if he was in idle mode. i would try reading the codes (even if a CEL wasnt thrown). could just be a sensor problem. Those are the worst!
 

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Well your at it, check the fuel pressure at the rail. If that is good, then I would think possibly the TPS. The fuel pump wont throw a code, but a weak one gave me the same kinda problems your having. Also a bad TPS doesnt always trigger a CEL, but they will do funny things when they go bad, mine would buck randomly when at highway speeds.
 
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