I'm looking for ideas on what my exploder is doing. It has a sort of surging/rolling vibration when at idle rpm. It does it in both park and drive. I've had it checked out and they say that there is nothing really wrong with it. The best idea I have right now is carbon build-up in the engine. If anyone can shed some light on this problem, I'd really appreciate it. I've heard that this is a common problem with this year of exploders. Thanks.

I bet that you have a 4.0 SOHC. Your problem is caused by leaking intake manifold o-rings. Do a search for the 00M12 program.