That's kinda funny, cause I only drive about 4 miles to work, but it's all freeway, so no buildup worries for me. How high is your idle? It'll diesel easier if the truck is idling higher too. If you can't find seafoam you can run by an evinrude/johnson boat dealer and snag a can of engine tuner. Works pretty much the same. Warm up your truck, spray this stuff into the carb till the truck either dies or you're nearly out of tuner then have somebody shut it off. Don't restart the truck for atleast several hours, if not a full day, and you'll see tons of crap come out the exhaust. I wouldn't recommend this though if you have a cat.
