I WAS APPROACHING A VERY BUSY INTERSECTION AND WHEN I APPLIED MY BRAKES THE CAR ACTUALLY ACCELERATED. I WAS ABLE TO STOP BEFORE HITTING THE VEHICLE IN FRONT OF ME. I PROCEEDED ABOUT A MILE DOWN THE ROAD AND AS I WAS TURNING INTO A STRIP MALL THE VEHICLE SUDDENLY ACCELERATED AGAIN. THIS TIME OUT OF CONTROL. I WHEN THROUGH THE TURN AND HIT A LARGE CURB AND THEN RAN INTO THE GUARD RAIL. I RIPPED THE GUARD RAIL OFF AND STILL PROCEEDED FOR AN ADDITIONAL 150 FEET ON THE GRASS BEFORE THE VEHICLE FINALLY CAME TO A COMPLETE STOP. IT SCARED THE HELL OUT OF ME.