first things first, you need to check the ecm for cap leak. the efi trucks will do all sorts of things but its usually missfires or stalling. second thing is to make sure you did not but cheap junky napa plug wires, they are crap. if they are the lowest quality ones they have on the shelf than you need to get rid of them. i bet if you popped the hood at night and take a look in the dark you will see a lightshow. once you get the ecm out post a pick of it. after that we can start working down the line of most likely probable causes. these trucks are simple and most issues are with the ecm on the efi models.