ok so back to square 1.....as soon as i put the car in reverse and started backing out of the driveway the light came back on and is misfiring on cylinder 4 still. So my question is if the piston landing or something is cracked wouldn't that mess up compression on cylinder 4. If it would then i have no idea what this could be cuz like i said before compression is 120 on cylinder 4 and 122 on cylinder 3 so i would say compression is fine