2014 BMW X5 XDRIVE. AS I AM ENTERING A PARKING SPOT, MOVING FORWARD, I STEPPED ON THE BRAKE TO STOP MY CAR, AND INSTEAD OF DOING THAT, THE ENGINE REVVED UP AND ACCELERATED QUICKLY. TRIED TO CLICK PARKING BUT THE CAR HARD STOPPED BECAUSE IT HIT THE ROCK IN THAT AREA IN FRONT OF ME. ABLE TO PUT IT INTO PARKING AFTER IT HIT THE ROCK. FRONT RIGHT BUMPER DAMAGED PRETTY SEVERELY. FORTUNATELY NO ONE HURT BUT IF WE ROLLED PAST THE ROCK ALL 5 OF US WOULD HAVE BEEN DEAD AS THERE IS A VALLEY INFRONT OF US. SIMILAR THING HAPPENED 10 MONTHS BACK WHEN WE ARE AT A TRAFFIC SIGNAL ENGINE REVVED UP AND MOVED FORWARD. WHEN WE CALLED LOCAL DEALERSHIP THEY SAID NO RECALLS AT THAT TIME.