MY WIFE DROVE THE TRUCK TO WALMART TO GET A COUPLE OF ITEMS WITH HER WERE MY SON IN LAW AND DAUGHTER. ONCE ARRIVING THERE(APPROX. 3 MI) THEY NOTICED SOME SMOKE COMING FROM UNDER THE HOOD. MY SON IN LAW OPENED THE HOOD TO DISCOVER A FIRE, HE THEN RAN INTO WALMART WHERE AN EMPLOYEE GRABBED A FIRE EXTINGUISHER AND PUT OUT THE FIRE. AFTER THEY GOT HOME I CHECKED IT OUT AND THE WIRING HARNESS THAT GOES TO THE MASS AIR FLOW SENSOR WAS COMPLETELY MELTED. IT WAS STILL IN ALL TH HE FACTORY TIE DOWNS AND WASN'T TOUCHING ANYTHING THAT COULD HAVE CHAFED IT OR PINCHED THE WIRES. THE TRUCK WAS ON CITY STREET THEN IN PARKING LOT