strange engine idle
car: pontiac bonneville, 1996, v6, 105K miles.
While waiting at a stop, I noticed that the RPM slowly started to increase all by itself! 700 to 1000 to 1200 to 1500 to 1700...
At this point I put the car in park and RPM jumped to 2500+. Turned off engine and turned it back on, everything back to normal.
I've also noticed that while slowly going through a parking lot, the car won't idle down but will stay at a "high" RPM (say 2000) - forcing me to stay on the brakes to keep from going too fast. After a bit, things settle down and everything is fine.
No error codes.