got an 03' 3500 crew cab dually 6 spd. man. with 153,000 miles on it, truck is missing pretty bad, really bad when it's cold, but still very noticeable & annoying when warm, typical white/blue smoke with the miss, the truck has a triple dog on it now, but had previously been ran with an edge ez stacked with the triple dog & both turned all the way up (previous owner) the truck runs out fine in the higher rpm's out on the interstate, but in the lower rpm's it has a hesitation/miss/studder, whatever u wanna call it, & like I said it's alot worse when it's cold, I'm thinking I have an injector(s) going south, truck starts good & has plenty of power, just doesn't run smooth at all, & in the last couple weeks it's had plenty of injector cleaner ran through it & a new fuel filter yesterday, & the miss seems to be as bad if not worse???? sound like it's injector related???? thanks Dusty

 

Any codes?

 

Time to set your valves?