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2006 with 180000 miles truck runs great when hot not so much cold. FICM voltage was a bit low had Ed repair and put atlas 80 tune in. Still runs the same (way more power)and voltage is good now. I switched too synthetic oil T6 and it made a very small difference. Also sometimes after I get of interstate it acts like it is missing when I do the in town driving but clears up after 10-15 minutes.
Also fuel mileage is per what I read here, is low about 15 no tow and 9 with 3000 lb tow. So my thoughts are too pull injectors and clean spools and new o rings. What I'm wondering is, would it be a bad idea to NOT do the nipple cup o rings with this many miles?
So other than that the truck runs awesome.
I do have Dashboss if there is something I need to check.
One other weird thing is after the FICM change the mileage computer is telling me it get 20mpg, before never above 15. I know this thing is not the gospel, just thought this was strange.