Okay, this only happens every so often, and I'm not sure if it's related to the outside temperature or not but it was 71° outside. I think I've had this problem last summer, and it went away. No CEL displaying. It's been a little colder the previous couple of days. Anyhow, on my '99 GT, I was driving home from work and I press in on the clutch, the idle goes to 2800-3000 and stays there while I'm coasting and maybe drops 500 rpms (to be ~2500) when I come to a dead stop. If I turn off the car and restart it - it idles just fine ~700 or so. Once it had idle to 3200 and went back down to 1800 in a smooth transition while coasting...
I continue to drive home, next stop light it happens again, go to the gas station where the car sits for 3-5 mins tops, get in and drive the rest of the way home and it would idle just fine the next 3 stoplights to my house. I just don't get this - it's variable, doesn't happen often but when it does it's irritating to be at a stoplight and have the car idle at 2800.
Perhaps it's related to when I come to a stop - at times, the car will surge to 300-400 rpms and bounce right back up to ~700. I've been through 2 IAC's and I have a new TPS. Could it be the MAF sensor going bad? I have about 95k miles on the engine.
I continue to drive home, next stop light it happens again, go to the gas station where the car sits for 3-5 mins tops, get in and drive the rest of the way home and it would idle just fine the next 3 stoplights to my house. I just don't get this - it's variable, doesn't happen often but when it does it's irritating to be at a stoplight and have the car idle at 2800.
Perhaps it's related to when I come to a stop - at times, the car will surge to 300-400 rpms and bounce right back up to ~700. I've been through 2 IAC's and I have a new TPS. Could it be the MAF sensor going bad? I have about 95k miles on the engine.