I've seen questions about engines revving when braking and when idling, but my engine revs way up (and stays up) whenever it's in park--whether on startup or shifting to park. It doesn't rev unusually like this in any other gear. What would be the most probable reasons?
2000 Saturn SL1 with 204,000 miles.
That particular engine (single cam) commonly has an intake gasket leak with high idle as a symptom. There are other common issues with the same behavior such as the throttle position sensor, idle air controller, and engine coolant temperature sensor. Some googling into saturn forums will provide more troubleshooting and info than I could in a reasonable-length post here.
