I have a 05 cavalier 2.2 I just started getting random misfires.the car will run perfectly at times. it will idle and I can rev to the limiter with no misfires. Then I move the car and it starts running horribly and stalling when watching my programmer I can see misfires on cylinder 3 mostly some on other cylinders. That keeps up for a little bit then will clear up and run fine intill I start to move it in my driveway and it happens again.

I have a good running car that I have changed coil pack plugs, tps, injectors,crank sensor, also have checked fuel pressure have 60 psi. Anyone have any ideas I�m running out of them quick don�t know why this problem is so intermittent.

Spark plug gaps? Plug wires in good condition, not old brittle, cracked, cross firing, grounding out?