those do not sound like the original plugs. people on this board have a variety of opinions which are the best to get, and I do not recognize whether thats a good one or not. Search for plugs you'll find some recommendations for and against specific ones.
I would clear that transmission code and run the truck a good 20 - 30 miles under the condition that you do not get a blinking check engine light. I've started to form an opinion about your vehicle - not bagging on it - and believe me, mine periodically likes to throw a code or 2. But my opinion is with the radio problems, the hvac display problems, the coil problem, and now this transmission problem... theres been some kind of mistreatment by prior owner. Good news is you are getting these worked out. Bad news is who knows whats coming next.
I'd clear that transmission code, and drive it around. See if the fuel and spark related codes you had before come back. Vary your driving: let it idle on driveway 10 mins, drive slow, come to a few complete stops, drive on the highway 10 mins, etc... this won't be every drive cycle, but it should allow car to present many if not all the codes that are recurring. Again, if you get some dramatic bad result discontinue testing and get towed. E.g. if you smell strong sulfur smell accompanied with check engine light, you are misfiring again and unburnt fuel is getting into the catalysts, which will damage them if you go on for too long.
My worry is that with the transmission code you are either looking at pulling out the BECM and working on it, or any other subordinate computers that control the transmission, or repairs to the transmission itself. :-(
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Pat Herman
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