Running rough and hesitation when accelerating from a stop. - Mustang Evolution

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Old 04-24-2013, 02:48 PM   #1
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Running rough and hesitation when accelerating from a stop.

I have a 1991, convertible, 2.3 stock engine. My car runs very rough when first starting and during acceleration. After a few minutes of driving the check engine light will come on and it starts running a lot better but still with some hesitation during acceleration. I have replaced the plugs, wires, both coils, Idle air control valve, throttle position sensor, fuel pump, fuel filter, battery, done an air induction cleaning, and run cleaner thru my gas. I use Shell premium plus gas. The only things left I can think of are the mass air flow sensor, although I did clean it and the engine will run differently when unplugging it while at idle, the fuel injectors, and PCM. Any suggestions??
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Old 06-28-2013, 08:05 PM   #2
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Try changing your ICM? I just did on mine it made a huge difference and maybe the coils as well

---------- Post added at 08:05 PM ---------- Previous post was at 08:04 PM ----------

Forget the coils lol just saw you replaced em
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Old 07-22-2013, 11:50 PM   #3
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Also if your car dies when you unplug you Maf the Maf is bad
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