ATTEMPTED TO START VEHICLE AFTER OVERNIGHT PARKING. WHEN I ACTIVATED IGNITION THERE WAS A LOUD EXPLOSION UNDER THE HOOD WHICH BLEW OFF MOST OF THE INSULATION LINING AND IGNITED A FIRE AROUND THE AIR INTAKE COVER. *AK I WAS TOLD THAT THE FUEL PUMP RELAY SWITCH FAILED. THIS AND THE FULE PUM WERE REPLACED BUT NOW VEHICLE WILL INTERMITENTLY ACCELERATE WHEN IDLING AND OR MOVING AT AROUND 25MPH.