VEHICLE WAS IN REVERSE AND MOTOR RACED AND VEHICLE TRAVELED BACKWARD AT RAPID RATE OF SPEED AND COULD NOT BE STOPPED IN SPITE OF BRAKING. ATTEMPT TO STOP VEHICLE WAS UNSUCCESSFUL. VEHICLE ONLY STOPPED WHEN STRUCK TELEPHONE POLE. PROBLEM WAS ENGINE RACING WHICH COULD NOT BE STOPPED. ACCELERATOR SEEMED TO STICK DOWN OR ACCELERATE WITHOUT FOOT APPLICATION. *TR