PLEASE HELP! hesitation and rough idle - Ford Mustang Forum
 
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post #1 of 3 (permalink) Old 04-01-2011 Thread Starter
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PLEASE HELP! hesitation and rough idle

Hi Guys.

I have been having a problem for a few months now and even ended up having to replace the engine because the block was craked from overheating. I still have the same problems. The car idles rough at first then smooths out, especially if I press the gas. This only happens when the car is warmed up. The car also hesitates at part throttle and wot. When I reset the computer that car will not hesitate as much for a few days then starts back. Here is what I have replaced so far, engine, throttle body, TPS, MAF sensor, fuel injectors, fuel pump, fuel filter, spark plugs, wires, coil, egr valve, exhaust manifold gasket, checked all vaccum lines. I would really appreciate any help. I just can't figure this stang out. ( Thanks!

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post #2 of 3 (permalink) Old 04-01-2011
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I noticed that the IAC valve wasn't on the list of things you've done to it. Could need cleaning or maybe replaced.


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post #3 of 3 (permalink) Old 04-01-2011
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WOW! That’s some laundry list. Not sure I have any useful input with all you’ve done already. Does it have the stock tune in the PCM? Plastic intake manifold have a hair-line crack maybe? Guess you could also check into the CATS, maybe one of those is partially clogged? Though you’d think that’d throw a code. Anybody shove a potato into the tail pipe (I know, stupid question)? Sorry I can’t be of more help.
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