CAR SUDDENLY LURCHES FORWARD AND ROCKS BACK AND FORTH. CAR WAS PARKED IN DRIVEWAY WHEN STARTED, IT SUDDENLY LURCHED FORWARD, ROCKING BACK AND FORTH LEAVING A BRUISE ACROSS MY SHIN FROM THE RUNNING BOARDS. TWO DAYS EARLIER, MY DAUGHTER CLOSED THE BACK HATCH WHICH CAUSED THE TRUCK TO LURCH BACK AND FORTH, LUCKILY, JUST BUMPING HER. THIS HAS HAPPENED NUMEROUS TIMES OVER THE PAST SEVERAL YEARS, EVEN THOUGH THE GEAR SHIFT WAS ALWAYS PROPERLY IN PARK WHEN IT HAPPENED.