Just for ****s and giggles, kill the power for a little to reset the learned tables in the pcm. I doubt it will have an effect, but I don't like the wot issue. It almost makes me wonder if an injector or two are leaking down, hence your loss of prime pressure and your random backfire. As I said before, wot while cranking disables the injectors to help aid in clearing a flood condition. Just a thought....give 1 and 5 extra attention if you check this. Could explain the clean plug, could be something else.
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