2003 Chevrolet S10

I BOUGHT A 2003 CHEVROLET S-10 P.U AT A USED CAR DEALER ON 11-13-09, DROVE IT HOME ON 11-14-09 THAT EVENING. ON 11-19-09, DRIVING IT HOME FROM THE REPAIR SHOP FOR NOT WANTING TO START, I PULLED OUT ONTO THE HIGHWAY AND THE SEAT SLID BACK ON ITS TRACKS. ON 11-29-09 LEAVING CHURCH, I PULLED ONTO THE HIGHWAY AND THE SEAT SLID BACK ON ITS TRACKS AGAIN. I GOT IT LOCKED IN PLACE AT THE NEXT STOP LIGHT, AND WHEN I ACCELERATED, IT HAPPENED AGAIN. WHEN I STEP ON THE GAS PEDAL TO ACCELERATE, THE SEAT ROCKS BACK, WHICH APPEARS TO DISENGAGE THE LOCKING MECHANISM FROM THE TRACKS, AND THE SEAT SLIDES BACK. I DROVE IT HOME ON 11-14-09 THAT EVENING. IT SAT IN THE DRIVEWAY UNTIL 11-17-09 THAT AFTERNOON, WHEN IT GOT TOWED TO THE REPAIR SHOP BECAUSE IT DIDN'T START ON 11-15-09. PICKED IT UP ON 11-19-09 AROUND 5:30 PM SAT IN THE DRIVEWAY THAT EVENING. DROVE IT TO WORK THE NEXT MORNING 11-20-09. GOT DONE WITH WORK AT 3:30 PM WHERE THE TRUCK DIDN'T START. HAD IT TOWED TO REPAIR SHOP. BEING THE WEEKEND, AND THEY'RE CLOSED ON WEEKENDS, IT SAT THERE THROUGH THE WEEKEND UNTIL 11-24-09 THAT AFTERNOON GOT IT BACK ON 11-24-09. SO FOR THE SHORT TIME I DID HAVE THE TRUCK, IT HAPPENED ON THE THREE OCCURRENCES I DESCRIBED. I'M 5'-6" TALL, SO WHEN I ACCELERATE, AND THE SEAT ROCKS AND SLIDES BACK ON ITS TRACKS, MY FEET ARE MOVED AWAY FROM THE ACCELERATOR AND THE BRAKE PEDALS VERY QUICKLY RENDERING THEM USELESS, UNTIL I CAN PULL MYSELF FORWARD USING THE STEERING WHEEL AND SLIDING UP ON THE SEAT. JUST DOUBLE CHECKING THAT THE LATCH IS DOWN. ROCKING BACK TO CHECK IF IT'S LOCKED. I HAVE AN APPOINTMENT TO TAKE IT BACK TO THE DEALER ON THURSDAY TO CHECK WHY IT'S NOT STARTING. I COULD PROBABLY HAVE THEM CHECK THE SEAT ALSO. *TR