I WAS APPLYING BRAKE PRESSURE AT LOW SPEED THROUGH A PARKING LOT , MADE A TURN TO PARK REVERSE, FOOT ON BRAKE PUT CAR IN REVERSE TO BACK UP, PUT FOOT LIGHTLY ON GAS PEDAL AND IT GAIN SPEED AND LURCHED FORWARD INSTEAD, OVER A CURB, UP AN SLIGHT INCLINE AND HIT LIBRARY WALL, AND STOPPED. AIR BAG DID NOT DEPLOY. I AM SORE, IT WAS TOWED AND I PAY TO HAVE IT TOWED TO MY MECHANIC TO LOOK AT NEXT WEEK.