MISFIRE only when AC is on
#3
Does it do it only when you have the a/c on at idle, or just at idle period? Could be some timing issues. You could also try adjusting the AAC valve; it's got a little rubber piece that comes off and you can adjust it with a screwdriver to help with your idle. If it starts misfiring whether you have the a/c on or not, it could very well be an injector on it's way out. The death of these injectors are intermediate; they'll keep kicking on and off until eventually they just die.
#5
Forgot to ask, do you have a VG or VE? If it's a VG, after checking your plugs, wires, vacuum, ect, try adjusting the AAC valve. Just have the car idling with the a/c on and adjust the valve until the idle stabilizes.
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