MINIVAN FAILED WHEN IT RACED AWAY OUT OF CONTROL AT EXTREMELY HIGH SPEED, WITH OWNER AT THE DRIVERS CONTROLS, AS A RESULT OF A SMALL PART IN A HVAC VENT SUPPORT LOOSENING AND FALLING INTO THE APPARATUS CONTROLLING THE ACCELERATOR CABLE, CAUSING THE ACCELERATOR TO BE STUCK IN A POSITION OF HIGH SPEED ACCELERATION. OWNER TRIED TO STOP THE MINIVAN AND COULD DO SO ONLY BY JAMMING ON THE BRAKE WITH BOTH FEET WHILE OPERATING THE VEHICLE UP AN INCLINED EXIT RAMP. *AK