I have an 02 Suburban that upon starting in the morning will rev high, then rev low almost to the point of dying. It will cycle this way for a while then stop somewhere in the middle but still is not idling correctly. My check engine light came on a few weeks ago and I had the guy at Autozone read the codes which was: lean mixture in both left and right side cylinders. His suggestion was to change the fuel filter which I did with no change in performance, and the check engine light is back on.

Any inputs would be appreciated.

Patrick

Just saw the note that this group is for 1998 and earlier, sorry.