[PeteA216]

I never thought of that... I'll check it out tomorrow, but how would that cause detonation? Oh and an update, I removed and cleaned all the plugs which helped a little but not much. I also made sure the knock sensor was working by putting a timing light on the engine and hitting the manifold with a hammer to see it the timing retarded and it did. I also checked the static ignition timing after the engine was warmed up and it was perfect at 0 degrees BTDC. Again, I'll check out the EGR system tomorrow morning, but in the mean time any more ideas would greatly be appreciated. Thanks!!!