2002 Ford E-550 Complaints

PURCHASED A USED FORD 550 DIESEL BUCKET TRUCK, IN NOV. 2007 TWO WEEKS AFTER TRUCK STARTED TO NOT START AT TIMES AND WOULD STALL WHILE DRIVING DOWN THE ROAD. WE DROVE IT TO THE DEALERSHIP AND HAD IT TOWED IN SEVERAL TIMES, DEALERSHIP WOULD SEND TRUCK BACK TO US AND IT WOULD AGAIN STALL ON THE ROAD, AFTER THIS HAPPENED TWO TIMES IN A ROW AND IT WAS BACK AT DEALERSHIP WHEN THEY TOLD US AGAIN NOTHING WRONG WITH IT. WE TOLD THEM TO TAKE IT HOME FOR THE NIGHT. THEY DID AND OF COURSE IT STALLED ON THE ROAD. THEY THEN STARTED TO BREAK DOWN THE ENGINE TO FIND WHAT WAS WRONG. THEY THOUGHT THAT THE INJECTORS AFTER BEING TAKEN OUT AND TESTED WERE NOT IN THAT GOOD OF CONDITION AND THAT THEY WERE THE CAUSE OF THE PROBLEM AND SHOULD BE CHANGED. WE HAD THEM CHANGE 7 OF 8 INJECTORS ALSO CALLED GLOW PLUGS. THIS CAME TO ABOUT $4000 SAME PROBLEM DIFFERENT STATE TRUCK WENT TO NEW DEALER SHIP WAS TOLD NOTHING WRONG WITH IT. PICKED IT UP AND DROVE IT AND OF COURSE IT STALLED ON THE ROAD AGAIN IT WAS TOWED I...