DRIVING HOME I WAS APPROACHING INTERSECTION IN WHICH A FEW CARS WERE BEGINNING TO MOVE AS I APPROACHED THE RED LIGHT. ON A COUNTY HIGHWAY, UPON SEEING THE SLOW START, I BEGAN BREAKING. UNFORTUNATELY I CONTINUALLY PUSHED BRAKE PEDAL TO FLOOR NUMEROUS TIMES WITH NO ABILITY TO STOP AND RAN MY VEHICLE UNDER BACK END OF A FEDEX DELIVERY TRUCK. ONE HEAD ON COLLISION OCCURRED MY AIRBAG CANISTERS INITIATED BUT BUT THE AIR BAGS NEVER DEPLOYED AFTER IMPACT I DID RECEIVE INDICATOR NOTIFICATION STATING AIRBAG SERVICE REQUIRED. PRIOR TO THE COLLISION O HAVE HAD TOTAL REBUILD OF MOTOR FROM BLOCK UPWARD BY GMC I REPORTED THAT NUMEROUS TIMES WHILE ON HWY MY CARD WOULD SUDDENLY STALL/ LAG . GOING FROM 65-70MPH DOWN TO 20-30MPH. HAVE HAD ENGINE MAINTAINED WELL AND CHANGING OIL ETC WAS TOLD ALL 3 TIMES I TOOK IT IS IT RESULTED NOTHING THAT COULD BE REPLICATED. DESPITE HAVING BEEN LUCKY SINCE IT COMMON APPARANTLY FOR MY VEHICHLE TO BEGIN LOSES OIL AND HAS TO BE REFILLED Q-2 X WEEK LY.( SEEMS TO BE COMMON COMPLAINT FROM AUTOMOTIVE MEN TO STATE ALL IS GOOD. 1) IT IS NOT ALL GOOD. 2) I COULD HAVE BEEN KILLED OR SERIOUSLY INJURED BECAUSE OF STALLING, FAILED BREAKING SYSTEM AND LACK OF AIR BAG.DEPLOYMENT.I ALSO TOOK SEVERAL TIMES FOR TIMING BELT REPAIR AND EVEN HAD MOTOR REBUILT AND ALSO DESPITE JUST HAVING PUT ON WHEN THIS STARTED 3 MONTHSEAGO, HAVE HAD ISSUES SINCE 4 MO AFTER BUYING VEHICLE ( HAD 20,000 MILES ON IT . OF COURSE AM ALWAYS TOLD NOT IN WARRANTY TIME LIMIT OR MY VIN # N