Change them spark plugs
I don't know when you changed your plugs, but I would do that immediately. Take the vin number of your truck to the dealer and get the right plugs for that truck. Its a pain in the but to change those last two plugs in the back but its necessary. While your at it, take apart the connectors for all of your coil packs and fuel injectors spray them good with electronic cleanner then pack them with diaelectric grease before you put them back together. Then take out your mass flow sensor and spay it heavily with the electrnic cleaner do not touch the little wires on it. The method to my maddness is to get that truck running as smooth as I can first, then go from there.