DRIVER LEAVING SERVICE CENTER PARKING LOT, AFTER VEHICLE WAS SERVICED. WHILE PULLING OUT OF PARKING SPACE, WITH FOOT STILL ON BRAKE, CAR RAPIDLY ACCELERATED, LUNGED FORWARD AT FULL SPEED, HITTING TWO OTHER PARKED VEHICLES IN THE LOT. VEHICLE WOULD NOT STOP DESPITE FULL APPLICATION OF BRAKES. WAS ABLE TO PUT CAR INTO REVERSE, AND THEN SHIFT TO PARK.