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My truck seems to "hunt" sometimes at idle speed....it'll rev up and down so very slightly, i dont even think i can see it in the tachometer. I heard high compression diesels like ours have a habbit of doing that.... not sure. it didnt always do that though, so im not sure. Anyway, you may want...

would dirty injectors have anything to do with it? how many miles are on the truck? maybe running various fuels has some crud built up on the injectors? Maybe try measuring the temperature of each cylinder somehow to see if there is much of a difference...possibly at an injector? Does your truck...