SEPT 14 2013. 1400 ON US 59S I WAS DRIVING IN THE FAR RIGHT LANE, AND A FUNERAL PRECESSION WAS EXITING RIGHT SO WE SLIGHTLY DECELERATED AND SWITCHED TO THE MIDDLE LANE. AS I ACCELERATED TO ACQUIRE THE HIGHWAY SPEED LIMIT THE GAS PEDAL GOT STUCK; IMMEDIATELY I KNEW THERE WAS A PROBLEM AND TOLD FIANCE TO CALL 911. I BEGAN TO CONTINUOUSLY PRESS ON THE BRAKE PEDAL WITH MY ENTIRE BODY WEIGHT. IT SLOWED THE CAR TO APPROXIMATELY 60 MPH AND IF I TRIED TO LIFT MY FOOT FROM THE BRAKE PEDAL THE CAR WOULD ACCELERATE EVEN MORE. ON THE PHONE WITH 911 --207PM-- WE WERE TRYING TO STOP THE VEHICLE. I MOVED MY CAR TO THE LEFT LANE AND THEN TO THE LEFT SHOULDER LANE. (DURING THIS TIME I WAS CONTINUOUSLY TRYING TO BRAKE AND SHIFT MY CAR TO NEUTRAL BUT IT WOULDN'T BUDGE; STILL BRAKING WITH THE BRAKE PEDAL, I TRIED TO APPLY THE EMERGENCY BRAKE) FIANCE QUICKLY RE-DIALED 911 TO GIVE OUR LOCATION AND LET THEM KNOW THAT THE CAR WAS COMPLETELY OUT OF OUR CONTROL AND THAT THIS WAS AN IMMEDIATE EMERGENCY. THE 911 OPERATOR TOLD MY FIANCE THAT A POLICE DISPATCHER WOULD BE CALLING HER BACK, TO WHICH SHE REPLIED WE NEEDED HELP IMMEDIATELY BECAUSE WE WERE APPROACHING ON SLOWER TRAFFIC. VERY QUICKLY AFTER, THE LEFT SHOULDER LANE ENDED SO I WAS FORCED TO MOVE THE CAR INTO THE FARTHEST LEFT LANE. IT SOON BECAME APPARENT THAT WE WOULD NOT AVOID A COLLISION, AND MY CAR HIT THE BACK OF A YELLOW SCION TC GOING APPROXIMATELY 100MPH. THE AIRBAGS DEPLOYED RIGHT AWAY, MAKING IT UNCLEAR IF WE HIT ANY