It started out as a slight, very slight white haze then over a probably three month period it has progressed. I took it in to a local dealer when it first started showing signs but they did nothing for me didnt even check the injectors said there wasnt an ses light so there was no need. Well since then i have a slight lope at idle and after sitting there idling after getting good and warmed up it will have a little white haze and when you accelerate itll puff white then get back to a black haze. and then yesterday coming down the interstate i ran up to eighty coming down the on ramp but as i backed the throttle off it got a progressive knock that would go away with hard acceleration but come back as you decelerated again, once i was going for a bit it didnt do it at seventy, but did again eighty( not sure what the rpms were tach isnt accurate probably in the 2600-2800 range. Have noticed a slight decrease in fuel mileage. no chips, programmers, stock air box filter only change is five inch mbrp exhaust

The truck has 196,800 pulled the vin check on it and has never had any injector work or any other done at that. The truck just sits and lopes at idle and after warm youll get a little constant haze of white smoke. Talked to a different dealer today and he said the same as far as the ses light is usually your primary indicator. As much experience as there is here on this board Im hoping for some good suggestions.