2003 GMC SIERRA 1500 HD Electrical System Problems

I EXPERIENCE AN INTERMITTENT PROBLEM WITH MY TRUCK THAT FLASHES AN ERROR CODE "REDUCED ENGINE POWER". THIS IS TIED TO ERROR CODE P1516. USUALLY THIS PROBLEM OCCURS IN COLDER PARTS OF THE YEAR, AND ON A COLD SOAKED ENGINE, BUT IT HAS HAPPENED OTHER TIMES AS WELL. AS SOON AS THE ERROR OCCURS THE THROTTLE SHUTS AND LEAVES THE VEHICLE WITH ONLY INERTIA TO ATTEMPT TO GET OFF THE ROAD. THIS HAS HAPPENED TO ME ON THE INTERSTATE, AND THOUGH I HAVE NOT HAD AN ACCIDENT YET, I DO CONSIDER IT DANGEROUS. I HAVE TAKEN THE VEHICLE TO MY LOCAL DEALER AND INDEPENDENT MECHANICS, AND THEY HAVE BEEN UNABLE TO RESOLVE THE PROBLEM. THIS SEEMS TO BE A WIDESPREAD PROBLEM WITHOUT A SOLUTION. *TR

A FIRE IN THE DASH BOARD IN THE MIDDLE OF THE NIGHT WHILE THE VEHICLE WAS PARKED IN OUR BACK YARD DRIVE WAY. DASH BOARD AREA MELTED WHERE THE HEAD UNIT AND CIGARETTE LIGHTER IS LOCATED. BURNED THE HEAD LINER WHERE A COMPARTMENT WAS. THE WINDSHIELD CRACKED FROM THE INSIDE/OUTWARD. BURNED SPOTS ON THE SEATS FROM THE DASH BOARD BURNING. EVERYTHING IN THE FRONT OF THE CAB IS BLACK. ALL WINDOWS WERE UP AND TRUCK WAS LOCKED. FIRE HAPPENED IN THE MIDDLE OF THE NIGHT WHEN WE WERE ALL ASLEEP. WE DROVE THE TRUCK ON 2/20/14, WITH NO PROBLEMS. PARKED IT IN THE DRIVE WAY ABOUT 5:30 PM ON 2/20/13. NEXT MORNING SAW THAT THE WINDSHIELD WAS CRACKED, BUT FACING OUTWARD. OPENED THE DOOR AND WAS IN SHOCK. THIS TRUCK IS VARY SPECIAL TO US. IT BELONGED TO OUR SON THAT PAST AWAY 1/10/2013. CAN'T SEEM TO FIND IF THERE...

NO WARNING ON MY 2003 GMC TRUCK SPEEDOMETER STARTED GOING FROM 70 MPH TO 120 AND BEYOND WHEN IN REALITY I WAS GOING PROBABLY 30 MPH. THIS COULD BE A SAFETY ISSUE BECAUSE A MAN NEEDS TO KNOW HOW FAST HE'S REALLY GOING AFTER A LITTLE RESEARCH THERE'S ALOT OF GM OWNERS WHO DON'T KNOW HOW FAST THERE GOING RECALL ANYONE. *TR