No one has said it yet but you may have a cracked intake manifold gasket. They cause the symptoms you are speaking of. It seems that some get the CEL with the crakced manifold gaskets and some don't. Mine had to get really bad before it started giving me a light.

By the way I couldn't get mine to show me that I had a bad gasket by using the propane test. Even with a rubber hose extension I couldn't get my idle to smooth out. May have something to do with the fact that mine were cracked on the inside (under the intake).

Joe

A gun in the hand is better than a cop on the phone.

98 Passport 33's, Supercharged, Calmini Bumper, rockbars, diff drops, Teralows, 4.77's, Aussie and ARB lockers, Safari snorkel, Optima red top.