First my transmission and now this. My '01 GT just started rough idling 2 days ago.... Starts fine, then idle will be very rough, vibrating the car. Tach bounces up and down and feels like its going to stall. After maybe 3-5 seconds of this it smooths out to just under 1000rpm idle like normal and it's fine until next startup.
- Normal idle at stoplights
- Revs to 4000rpm in park fine, once it smooths out that is
- Temp is fine (gauge never gets higher than about 1/3)
- No hesitation (driven maybe 120km city/highway since this started and did not notice any hesitation or loss of power)
- No CEL
In fact other than the first few seconds at startup it seems totally fine. I did change the air filter the other day, needed to be done anyway, and it had no effect on the problem.
2000 grand prix problem starting - YouTube looks exactly like this except it never does stall, just tach bounce like that between around 500-1500rpm then smooths out to normal in a few seconds.
MAF? CPS? Plugs/wires? Something else?
