Hey Guys! I have a 03 Chevy Silverado Duramax 3500 that won't start. A so called friend put dirty Diesel in the truck. Afterwards I soon found out to steal batteries out of it. The gas tank has been cleaned out and small square filer was changed. It cranked for a min then would only start with ether spray. Can anyone tell me what I else I can do to fix it. It was my dad's and the only thing left I have of him. If anyone can help Id greatly appreciate it. Thanks in advance.