I WAS BACKING OUT OF A PARKING SPOT. WHEN MY CAR STALED AND WAS SHAKING IN REVERSE. I SLAMMED ON MY BREAKS BECAUSE I THOUGHT I BACKED UP INTO SOMETHING. WHEN I PUT MY CAR IN DRIVE AND TOOK MY FOOT OFF OF THE BRAKE PEDAL. MY CAR IMMEDIATELY ACCELERATED TO FULL SPEED OUT OF NO WHERE AND CAUSED ME TO CRASH INTO TWO CARS.