TRYING TO PARK THE CAR IN DRIVEWAY REVERSING NOTICED SUDDEN ACCELERATION,IMMEDIATELY TRIEDTO BREAK AND PARK COULDNOT STOP THE CAR.IT STOPPED AFTER HITTING THE GARAGEWALL. BIG DAMAGE TO GARAGE WALL . IMPACT SHATTERED THE THE BACK WINDOW DAMAGED THE EXHAUST AND DENT THE REAR DRIVER SIDE ,BUMPER AND SIDE LIGHT. PRIOR TO THIS INCIDENT TWO INSTANCES NOTED SOME UNEXPECTED ACCELERATION.DIDNT THINK MUCH ABOUT IT. LOOKING BACK SOME ISSUE MAY BE THERE.