Just bought a 2004 3500 with 250000. Truck has been sitting for 2 years and I jokingly offered him a number super low and he jumped on it. Now I own a 3500 that doesn't run. The truck also didn't run whe he parked it. It'll run all day if you keep it primed. Note, I am new to this whole forum thing and new to duramax. I own a 12 valve and know it good but can't really tell you anything about this thing. I need help!!