I am talking with a guy that has a 4106 that he says will sputter at about 20 mph, then take off and run good. He says he was told it sounds like water in the fuel. Any other ideas on what it could be? Fuel filter? What could the worst case for this be? Im interested in this bus, but don't want to travel several states to look at something that I could rule out with your experience. It has a auto trans if that matters?