MY CAR WAS STOPPED AT A STOPLIGHT WITH A VEHICLE IN FRONT OF ME. I SHIFTED INTO NEUTRAL AS I NEEDED TO TAKE MY FOOT OFF THE BRAKE. THE CAR WAS ON LEVEL GROUND SO IT WOULD NOT ROLL FORWARD OR BACKWARD. I PUT MY FOOT ON THE BRAKE AND SHIFTED BACK INTO DRIVE. THE CAR ACCELERATED WITHOUT WARNING. I JAMMED ON THE BRAKES, BUT THE ENGINE WAS RACING AND I COULDN'T STOP MY CAR FROM HITTING THE VEHICLE IN FRONT OF ME. I HAPPENED TO GLANCE AT THE TACHOMETER DURING THE INCIDENT AND SAW THE NEEDLE DROPPING BELOW 4,000 RPM. THE ENGINE RETURNED TO NORMAL RPMS AFTER THE COLLISION. NO ONE WAS INJURED AND THE DAMAGE TO BOTH VEHICLES WAS MINOR. BOTH VEHICLES WERE ABLE TO LEAVE THE SCENE UNDER THEIR OWN POWER.