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?