General 120K maintenance
 

2003 Ram2500, 5.9L, only owner - just hitting 120K miles and am planning valve adjustment. Truck runs great except when at idle - wondering if I have a computer gremlin or if this could be fuel delivery issues? Heard about lift pumps going bad... an ACS??? a solinoid of some sort? Or could I have a bad injector or two. I do have a Bank's kit on the truck since 50K - controller, 3" exhaust, pyrometer... no oversized intercooler or air intake. Have put sulfur additives in occationally but haven't been spot on timely.

Thanks in advance for some insight

Estates4627