Don't bother with the right side of the truck. It's only spark plugs and wires under there. The three coils under the plastic on the left side delivers the spark to two plugs. One on the right side and the one right under the coil. What I think is happening is that the boot right under one of the coils has lost its insulation value. When you pull the coil the boot that covers the spark plug will come off with it. Look at where the spark plug goes into the hole of the boot. If it looks as though the spark is going through the rubber into the metal right next to it then I would say that is where you are getting your hesitation.
Let me know how it goes.
Jared