dresserman... if I were to take a guess to what's the problem, it would be that the driver's door vacuum element(thats the black piece that sucks air in and out to lock/unlock the door) is bad. It turns bad when there is a wear in the rubber and its not allowing pressure to build up to do what its supposed to do. I would first make sure that the hoses are fastened securely to the element.. if it is... I would test out the element to confirm.