I took our family truck to a local diesel mechanic because we couldn't figure out what was wrong with it. Apparently neither could he. He told us that it was 3 bad injectors we paid him $2200.00 and it still no start.Then he told us how the computer could cause that to happen so we changed the main computer. Still no fix we eventually had our truck towed home and purchased a diagnostic tool to attempt fixing at home. I just feel that a professional should change parts like this.That's a very expensive way to fix a truck we can change parts until we get it right ourselves. I have found out through other mechanics advice now that 3 injectors showing up bad reflects a wiring problem. Not that they just went bad at same time.