SPEED WAS ABOUT 20-35 MPH. ENGINE RACED AND CAR SURGED FORWARD INTO CAR AH EAD, PUSHING THE CAR AHEAD FORWARD. BRAKING WAS VERY DIFFICULT. THE AIR BAG DID NOT DEPLOY. MY MECHANIC INSPECTED THE CAR AND FOUND THAT THE TRANSMISSION MOUNT BRACKET WAS SHEARED IN TWO WHICH CAUSED THE TRANSMISSION TO SHIFT FORWARD ACCELERATING THE CAR.