Power loss while accelerating

I have a 1999.5 so far have replaced the head in cylinder 1, cam shaft, new timing, tensioners water pump...whooo hoo. The valve on the turbo was replaced (rusted shut) and re calibrated. Now occasionally as I accelerate there will sometimes be a sputter around 3000 rpms (manual) at whatever speed, and I will no longer have the use of the turbo until I cycle the key and it temporarily fixes the issue. Is this an intake problem in the turbo valve again, or possibly an MAF issue?

Thanks in advance
Jason

Not sure how you replace a head, only on cylinder 1...

Not a MAF issue... you are going to need to give us the code in the ECU from going into limp mode...

Power loss

Yeah, I don't know about the head you got me...but that is what the diesel fuel system mechanic did, I just thought it had to be a cyclinder thing becuase the orignal code was misfire in cylinder 1. Anyway, I will search out a computer to get the code(s) hopefully today. Oh yeah he replaced the lifters as well.

Sounds like limp mode read the link in my signature...