WHILE ATTEMPTING TO PARK MY VEHICLE ON APRIL 20, 2017, MY CAR SURGED FORWARD AND DID NOT SLOW DOWN WHEN BRAKES WERE APPLIED. I HIT ANOTHER PARKED VEHICLE AND DID CONSIDERABLE DAMAGE TO THAT VEHICLE AS WELL AS TO THE FRONT END OF MY CAR. OVER $6,000 WORTH OF DAMAGE WAS DONE TO MY CAR ALONE. ON SEPT. 7, 2017, AGAIN WHILE TRYING TO PARK MY CAR, I WAS ADVANCING VERY SLOWLY AND PRESSING VERY LIGHTLY ON THE ACCELERATOR PEDAL WHEN THE CAR SURGED FORWARD VERY QUICKLY. I TRIED WITH GREAT FORCE TO APPLY THE BRAKE SO AS NOT TO HIT ANY OTHER VEHICLES NEAR ME. LUCKILY, I WAS ABLE TO GET THE CAR TO STOP BUT WAS FRIGHTENED TO DEATH. THE ACCELERATOR PEDAL DID NOT RESPOND APPROPRIATELY TO THE LITTLE PRESSURE I APPLIED WHEN ATTEMPTING TO PART THE CAR IN BOTH INSTANCES.