Around 6 months ago, my brother bought a 2008 ford f350 with a 97 12 valve cummins, it ran great, everything was fine. But around a month ago it began having some issues, the battery dies within 1 hour of shutting the car off. Also when we are driving around the car stalls when we come to a complete stop and on some occasions it stop before we come to a complete stop. He took the truck to our mechanic and he had the truck for a while now, and the thing doesn't seem to get fixed. The mechanic is trustworthy, he has fixed all our diesel engines for the last decade, but just this damm truck. We need help. Thank you.