Help! Hard miss under load
I have been lurking and using all the helpful threads here since I got my truck this spring, but I have had one major unresolved issue and am about out of ideas. This is my first diesel and am not a mechanic, but consider myself mechanically inclined. Okay here is the issue:
The truck has a 1997 7.3 mated to the zf5. It idles smooth and accelerates fine in any gear to about 2500 RPM then begins to miss violently. The whole truck shudders like it is running out of fuel, but i have the FPR shimmed and fuel pressure never drops below 60psi or so at any point. If i let off the pedal i can ease it over 2500 rpm but if i put the pedal down too much it begins to shudder and stumble again. In neutral i can rev to redline with no issues.
I have replaced the IPR, CPS, checked fuel pressure and HPOP pressure at all speeds and RPM, visually inspected uppipes and turbo boots for leaks, removed cat, removed VC and checked all injector connections and unplugged each to check contribution. I have removed and inspected every sensor I can find with no luck. This is a constant problem, I have never been able to rev over 2500 under load since i've had the truck and am running out of things to check.
Thanks in advance