CONSUMER HAS HAD 2 ACCIDENTS RELATING TO ENGINE ACCELERATION. BOTH TIMES THIS HAPPENED THE SAME WAY. CONSUMER HAS A VERY STEEP DRIVEWAY. ON SEPT. 11-2000, VEHICLE WAS IN REVERSE & IT ACCELERATED BACKWARDS AT A MAXIUM SPEED. MECHANIC FOUND THAT THERMOSTAT RING GASKET, IDLE AIR CONTROL VALVE & COMPUTER SCAN WERE THE CAUSES. *AK