First of all, I would look at the mounting bolts for the coil and make sure they are torqued properly. If it is ok, then I would be looking at wires replace the plugs along with them. Cracking is unusual but it sounds like you have done the basics. I would not be so quick to replace the pcm.
The o2 sensor has nothing to do with it. It may be a failed heater internally that requires replacement
Wednesday, October 12th, 2011 AT 2:21 PM