WHILE PULLING INTO PARKING SPACE (RIGHT) IN PARKING GARAGE MY EXPLORER EXPERIENCED A SUDDEN ACCLERATION-AT FULL THROTTLE (SNAPPING THE STEERING WHEEL TO THE RIGHT) (EXTREMELY LOUD REVVING, WHINING AND ANOTHER SOUND LIKE A BAD BELT SCREECH ALL AT THE SAME TIME) BEFORE THE CRASH. NO BRAKES (PEDAL WENT TO THE FLOOR). CRASHED INTO STEEL I-BEAM BENDING IT AND CRACKING CONCRETE PILLARS. NO AIRBAG ON IMPACT.