Car shifting wierd and RPM jump [Archive] - GrandAmGT.com Forum

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Vimjah
10-08-2005, 04:19 PM
so lately my car has been shifting a little wierd (downshifting right after shifting into 2nd and then back into 2nd almost instantly), at first I thought it was a trans problem, but now i'm starting to think it's the PCM. RPM's will randomly jump on the tach up or down 1000 and then back to where it was, and today I was accelerating hard and as soon as it hit 5000 RPM the car backfired and wouldn't shift. So does anyone have any ideas? Am I partially right here thinkin it's the PCM?

Ridenour
10-08-2005, 07:39 PM
Bad MAF.

videoman
10-08-2005, 11:28 PM
I would suggest the same, take your maf out and check that there is not dust on the resistors( be extremely careful ). With oil based filters like K&N's they can sometimes leave a mild film on the sensor causing weird data to be passed. For cleaning use a q-tip and lightly dust it off.

cheers