I have a 2001 cummins that is bored .020 over,scheids cam,port and polished head, valve springs, edge comp and superchips, 64/14 turbo, ats intake and exhaust, 4" exhaust, fass 150, 150hp injectors, hot rod vp44, oringed block, 14mm head studs, and lots of tranny work. Nitrous too but not hooked up yet.

I just got the motor back and put it in and when I get around 25-30 pounds of boost the engine starts to studder and the exhaust pulse smoke. If I stay in it I can get to 40psi. Before I blew the head gasket I could get 50psi. I have 13psi of fuel at wot. Is this a fuel problem?

The engine use to have a lumpy idle now after running it hard a couple times it has a steady sound like the rpms are up