Ive been having idling issues ever since i got this car. Slowly ive been replacing every part that could cause an idling issue. so far ive replaced the IAC valve, MAP sensor, ECT sensor, spark plugs, ECU (someone put the wrong ECU in it) cleaned the FITV and burped the cooling system. I checked my wires and they seem to be working right. As I replace every part, my idle problems seem to improve. Now ive gotten it to where the AC is really the only thing that bogs down my idle. it drops it down to about 250-350 rpm. Can someone help me out?

 

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