number 3 misfire

[BillBoost37]

If it's always one cylinder, it's not TPS, IAC or sensor related. It'll be plug, plug wire or coil. ....once in a while..ICM, but that's a last resort.

[Spartanzz]

well now see thats the thing plugs, wires, ICM, coil to that cylinder are all new. And, i swapped injectors around to see if it was that and it stayed in number three. It has a new fuel filter iv run fuel injector cleaner through it we replaced all the vacuum lines and even sea-foamed the car. The only thing that stops me from thinking it is mechanical is teh fact that it goes away when the ac is on or when i hit the gas. What else could it be?

[BillBoost37]

Swap plugs between 3 and 5, see if the misfire moves. maybe a cracked plug.

New parts can be bad. If none of this cures it..I'll send you under the valve cover.

[Spartanzz]

ill do that today will be sitting at home most of the day anyway but...just cuz it wasnt too expensive i got a IAC just to be sure didnt seem to change but dont i have to unplug the battery for 10 mins? cuz i herd with a new iac the computer has to relearn the idle is this correct?

[BillBoost37]

I've never relearned one...Not sure...unplug it anyway. But for 30 min.

[Spartanzz]

ok i just went outside and swapped the 3 and 5 plug and unplugged the battery. Is there any possibility it could be the egr or the tps?

[BillBoost37]

Things like the sensors..only sense. The EGR and IAC control exhaust and vacuum into the motor to make it run differntly. They do this before the SC or right at the TB basically. That's why one cylinder misfiring is never caused by them. Because all cylinders are pretty much fed the same by the stuff.

The only things that effect one cylinder are injector, injector wiring, valves, piston, plug, wire, coil, icm.

Now you know all my secrets of diagnosing and I'll have to silence you..want a bribe?