MAKING A LEFT TURN ONTO A MAJOR ROUTE AT 30 MPH WHEN ALL OF A SUDDEN THE VEHICLE TAKES OFF ON IT'S OWN AND BEGINS TO SWERVE PICKING UP SPEED WHILE BOTH MY FEET ARE OFF OF THE PEDALS. IT HITS ONE CONCRETE WALL ON A BRIDGE AND PROCEEDS TO CROSS YELLOW LINE PICKING UP MORE SPEED BEFORE SMASHING STRAIGHT INTO OTHER CONCRETE WALL. IT'S THE ONLY THING THAT STOPPED THIS VEHICLE FROM CONTINUING ON. AIR BAGS WENT OFF AND SPLIT EXPELLING STRANGE ODOR. A JEEP DEALER COMMENTED THAT EITHER A SENSOR WENT OR ACCELERATOR PEDAL HAD STUCK. I COULD NOT STRAIGHTEN THE VEHICLE OUT BY STEERING AT ALL.