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Been a busy week, but I did get a chance to turn it back down to approx. where it was before. Rough idle and surging are completely gone now. I assume that a previous owner had already turned up the IP and I just pushed it too far with my additional 1/8 turn. The EGTs never got too high with it...

Chaski, sorry for the confusion. Yes, I removed the guide pin and governor spring in order to line up the hole to turn up the pump. Reinstalled the governor spring assembly, reinserted and tightened down the guide pin screw, etc. Good eye, I just skipped over that part since it was...

I should add, this may be entirely normal for those that turn up their IP, but if so I was not expecting it. My gut tells me there's an issue with the fuel - whether it's delivery, injectors, timing, etc. Is it possible that the extra 1/8 turn has magnified a possibly worn out or faulty injector...

I've been researching the heck out of this site and a few others about a problem I'm having. Hopefully someone here can help me out. I have a K&N air filter, 2.25' mandrel bent dual exhaust from the manifolds back with h-pipe, and hi flow Hooker Aero mufflers. The truck has always had a...