DURING THE PROCESS OF STARTING THE VEHICLE: FIRST ATTEMPT TO START THE VEHICLE, IT DIDN'T START. THE SECOND ATTEMPT TO START THE VEHICLE, THERE WAS A LOUD BANG (EXPLOSION) UNDER THE HOOD WITH AN ODOR OF 'BURNT PLASTIC'. UPON LOOKING AT THE ENGINE, THE BLACK PLASTIC INTAKE MANIFORD HAD A HOLE IT FROM THE EXPLOSION. THIS IS THE SECOND OCCURRENCE IN 3 MONTHS. I HAVE REPLACED THIS INTAKE THIS PAST WINTER AND THIS OCCURRED AGAIN LAST WEEKEND. IT SEEMS IN MY RESEARCH THAT GM IS IGNORING THIS DEFECT AND WILL NOT OFFER A FIX TO THE PROBLEM. GM KNOWS THIS IS HAPPENING ESPECIALLY WITH "COLD STARTS" BUT HAS YET ADDRESSED. *TR