It ran fine until yesterday. When I would go start it, it would take like 2 trys before it would turn over. Then, while stopping at a light, it began to shake and shut off. We tried to start it but nothing doing. We parked it and 4 hours later it started, made it half way up the trailer and now won't start at all. The fuel filter and the fuel pump checked out fine. Kinda at a loss as to what may be going on with it! It's a 6.0 diesel if that helps any.