I have noticed an occasional rough idle with 2006 K3500 SRW. No smoke, no fuel knock (maybe the slightest marble-in-can rattle just when you lift), good mileage and normal power.

Comes and goes, but when its present, its noticable enough to get your attention compared to the normal, smooth silent idle all the rest of the DMaxes have.

Ideas? I am running fuel treatment to see if this helps. So far, no change. Too soon for injectors, but they are under warranty just in case.