WHILE BACKING OUT OF PARKING LOT, ENGINE STARTED RACING AND VEHICLE MADE A LOUD POPPING NOISE AND WENT FULL THROTTLE FORWARD OVER SIDEWALK , HIT A PARKED VEHICLE AND PUSHED VEHICLE (2) FEET SIDEWAYS. DRIVER HAD TO PUT VEHICLE IN PARK AND REMOVE KEY TO STOP VEHICLE. WAITING FOR INSURANCE AGENCY TO LOOK AT VEHICLE. *AK