self accelerate

My 1994 Bonneville accelerates even when I am not pressing the gas pedal. This begins as soon as I start the car. When put in neutral or park, the RPMs kick up to and remain around 3,000. On the road at high speed, conversely, (~60mph), the RPMs occasionally remain worryingly low (around 1.5-2...

Its a Montana 2003. Some overheating but not is the main problem. The main (BIG) problem is later 45 ~ 60 minutes driving (depending how much the day is hot and the trafic, and some time later the nail of the temperature gauge fluctuates over half) self accelerate and mainly I have to push...