2006 lbz no start
 

New to this forum but I need help I was driving my 2006lbz it started to run bad I stopped it started to run great agin I checked my pressures on my scanner and checked for codes and all was good made it about another mile and a half and it started to run bad agin but this time died completely and throw a code for crank position sensor replaced sensor but no change I tried 3 different sensors all from different places I tested the last one I put in to make sure it worked and still nothing checked fuel pressure that was good compression was good over 300psi on all pulled the glow plugs and you can see the fuel misting out from the injectors firing tried a known good ecm just to test and that was good as well I took a scope and the timing gears looked good and felt tight I’m not sure what else to check if anyone has any idea I would greatly appreciate the help