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Call The Guys at Scheid Diesel a call (800) 669-3533 . I would say either the pump is in need of a rebuild or there is low compression.

I would try putting it back to stock timing , you might be adding fuel at the wrong time in the combustion process and causing it to not be burnt completely. Good luck with it, I'm jealous , I have always thought one would be cool to own.

6.2, or 6.5, how does it run? I would do a cylinder drop test and find what cy.l is causing the problem, you just need to find why the fuel isn't getting burnt.