2016 BMW 340I Engine Problems

SUDDEN ACCELERATION - ON TWO OCCASIONS (JUNE 12 AND 27, 2016), WHILE SLOWING AND COMING TO A STOP (ONCE TO PARK AND ONCE TO STOP AT A RED LIGHT BEHIND ANOTHER VEHICLE), THE CAR BUCKED AND REVVED AND WAS INCREDIBLY HARD TO CONTROL, LURCHING FORWARD. ON THE FIRST OCCASION IT LURCHED FORWARD AT A HIGH RATE OF FORCE AND HIT A FENCE AS I WAS PULLING IN SLOWLY TO PARK - I COULD NOT CONTROL IT WITH THE BRAKE UNTIL I PUT IT IN REVERSE; ON SECOND OCCASION (2 WEEKS LATER), I WAS ON A CITY STREET SLOWING TO 5MPH AND STOPPING AT A RED LIGHT AND SUDDENLY WHILE I WAS FULL FOOT ON BRAKE THE CAR WAS REVVING AND BUCKING AND I COULD NOT CONTROL IT UNTIL I THREW IT INTO PARK. FOOT HARD ON THE BRAKE THE WHOLE TIME. BOTH TIMES DRIVING COMPLETELY STRAIGHT AND VERY SLOWLY INTO...