I WAS SITTING BEHIND ONE VEHICLE STOPPED AT AN INTERSECTION WAITING FOR THE LIGHT TO CHANGE. THE ENGINE SUDDENLY REVVED AND LUNGED FORWARD. DESPITE DEPRESSING THE BRAKE AS HARD AS I COULD, I WAS UNABLE TO PREVENT THE CAR FROM CRASHING INTO THE CAR IN FRONT. I BELIEVE THIS SURGE MAY HAVE HAPPENED PREVIOUSLY. APPROXIMATELY 1 1/2 YEARS AGO, I WAS ACCELERATING UP A HILL WHEN I SUDDENLY FELT A SURGE FORWARD EVEN AFTER I STOPPED PUSHING THE ACCELERATOR. *LA