whats serial number?
need to determine what Tier level this truck is so we can determine what injector body it has. Early Tier 1 models had different injector body's , then there was a change at pre-tier 2 and several service grams had come out on this since then, even a mandatory injector body change out.
what edward and kevin suggested are certain possibilities of course :o)

Also....

I did come across a bulletin about engine surging above idle that deals with the alternator over charging and causing an over-current in the electrical system, this effects the fuel system components as well as other components.

Check the alternator output, make sure it is within the range of 13.8 to 14.9v , if any higher then the chassis and engine block ground should be checked and repaired, then recheck the output.
The volt drop test from battery to chassis and battery to block should not exceed 0.5v.
If problem persists then the alternator should be repaired or replaced.