I DROVE FOR ABOUT AN HOUR ON A STEEP MOUNTAIN ROAD. SOMETIMES USING THE OVERDRIVE TO GO UP STEEP GRADES. THE CRUISE CONTROL WOULD NOT WORK. I MADE IT TO TOWN AND WAS ON THE MAIN ROAD STOPPED IN TRAFFIC. SUDDENLY, THE RPMS RACED AND THE JEEP ACCELERATED ON ITS OWN. I HAD MY FOOT ON THE BRAKE, BUT HAD TO PUT IT IN PARK TO STOP IT, BUT NOT BEFORE IT HIT THEN TRUCK IN FRONT OF ME. I WAS SHAKEN UP AND CHECKED THE FLOOR MAT TO MAKE SURE IT WAS NOT TOUCHING THE GAS PEDAL. IT WAS NOT.