2000 Pontiac Montana Vehicle speed control Problems

“My 2000 Pontiac Montana (ext) has been accelerating on its own. I have tried to determine the cause and effect, but nothing stays constant. It may happen when the car is cold or hot, early morning or late afternoon, etc. I have taken it into a dealership and they cannot reproduce the issue. In addition, they have told me the computer did not register any codes. When the issue happens the idle. I'll put the car into park and watch the RPM move to 3500 and stay there until I turn the car off. Once I turn the car off and turn it back on then the issue stops. …”

“New march 2000. Van always receives regular maintenance. The following is a history of repairs: 4/00 windshield wipers would not return to closed position - dealer fixed. 12/03 (37,179 mi) tps sensor breaking down causing idle to surge - dealer replaced throttle position sensor, completed reprogram ($255.14) 12/03 (37,182 mi) air bag light coming on - dealer replaced right front seat belt buckle under warranty (labor $134.51). 12/27/03 (37,555 mi) was in collision (other vehicle pulled out in front of me as I was coming down small overpass, he was cited). …”

“Engine went wide open, had to turn key off to kill motor. Lucky we were on a back road with no traffic,we also have teenage drivers, they may have paniced and it could have turned out really bad!!”

“Rpm needle goes up and down, and engine check light comes on before vehicle stalls. Vehicle was checked six times by same dealer, and problem couldn't be found. Vehicle is at another dealer to see if there's a change.”