THOTTLE HAS STUCK 15-20 TIMES - VEHICLE HAS BEEN DRIVEN ABOUT 500 TIMES. TWICE IT STUCK AS WE APPROACHED HIGHWAY CROSSSTREET AND ONCE IN ANCHORAGE AT AN INTERSECTION. OTHER TIMES THERE WAS NO TRAFFICE AROUND. DEC 23,'99, JOHN WAS BACKING UPHILL WITH A PIANO IN THE PICKUP - 5 PEOPLE WERE WITNESSES-HE CREPT BACK UP AN INCLINE TOWARD THE DECK AND PUT ON THE BRAKES - THE TRUCK CONTINUED UPHILL WHILE HE PUSHED ON THE BRAKES. ALL FIVE PEOPLE YELLED, "STOP" BUT THE VEHICLE WOULD NOT STOP AND HE RAN INTO THE DECK AND STEPS, WHICH BROKE THE RAILING. THREE TIMES I HAVE HAD IT INTO CHEVY DEALERS, BUT THEY WOULD NOT FIX IT AS THEY COULD NOT DUPLICATE THE PROBLEM.