WHEN SLOWED TO NEAR STOP AS WHEN PARKING, VEHICLE SUDDENLY ACCELERATES AS IF ACCELERATOR HAS BEEN HEAVILY DEPRESSED -- FOOT IS ON BRAKE, NOT ON ACCELERATOR. . DOES NOT OCCUR EVERY STOP. NO WARNING WHEN VEHICLE SUDDENLY ACCELERATES. LAST TIME THIS HAPPENED, VEHICLE ACCELERATED WHEN BEING PARKED,AND ALMOST RAN THROUGH BUSINESS STORE FRONT. OPERATOR TRIED PUTTING TWO FEET ON BRAKE = NO RESULTS...OPERATOR BARELY ABLE TO THROW INTO NUETRAL TO STOP VEHICLE. MASSIVE DAMAGE TO FRAME OF TRUCK. FORTUNATELY, NO PERSONS INJURED OR REAL PROPERTY DAMAGED. CONCERN IS FOR FUTURE DRIVING WHEN VEHICLE IS REPAIRED. THIS SEEMS VERY DANGEROUS. *AK