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Hmmm. Possible fuel problem, maybe pump/pressure, or dirty injectors, but sounds more like electrical/ignition to me. Could be clogged Catalytic Converter, especially if problem set in gradually over time.
Have you had the truck for a while? Did the problem start before or after the tune-up? Did it begin suddenly, or gradually? What did you set the plug gaps to?
Try this: Remove air cleaner, start truck, climb up where you can see into the throttle body. (Be safe - Keep your face back as far as possible!). When you can see the spray of fuel coming out of the injectors, see if it is a nice, even spray pattern. Then put your hand on the throttle linkage and gradually increase the speed until the misfire begins. Note if the spray pattern changes, or becomes intermittent (starts/stops rapidly). Let us know what you find. -Dan.
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