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Message: [QUOTE="Matt_P, post: 1379048, member: 277"] I have a 6.4 in the shop right now that I just rebuilt the engine one. I got it all buttoned up yesterday and went to start it and once it built rail pressure it souded like it only fired on a couple of cylinders and just sat there and chugged for a couple seconds and then died. Other times it will crank and the second it is about to fire it dies immediately. The only code I get is a P1336 cam/crank range performance. Ive tried a couple different cam and crank sensors and ohmed out all the wiring and its all good. Rail pressure when it starts chugging gets up to 10k All the injectors were sent out and flowed when I had the engine torn down. The only odd thing Im seeing that is that when it starts chugging the cam and crank synchronization goes to NO when it acts like its about to die but yes when it bumps back up. but during cranking its at yes the whole time and when the rpms bump. RPMs cranking go from 160-280 RPMs when its sitting there chugging go from 0-680 This is just a problem Ive never encountered and after 16 hours of messing with it yesterday its time to reach out so I can get this solved. Thanks again in advance for any help! [/QUOTE]

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