1999 Chevy Tahoe. Slight misfire at 750 revs, hard shift 1st and 2nd.
I have replaced cap, rotor, wires, plugs, MAF, air filter, cleaned the ERG and had the transmission checked (they said it was fine). In Park it is ok at 500 revs, but if you increase it to 750 -1000 there is a noticable vibration in the cab. On the road there is a slight hesitation at around 35mph (again about 1000 revs), I have had occasion when once warm there is a hard shift 1st and 2nd, and aoocasionally with cruise on, it seems like it cant make its mind up what gear it wants. As the stutter occurs in park I assumed it was not the tranny, I may well be wrong.
No codes, the only time it did throw a code it was P8070, but that was a while back and it hasnt thrown that again. Any ideas?
Tuesday, June 28th, 2011 AT 7:28 PM