Another update
Dave, I don't mean to question your comment, but a mechanic in the area I called today has told us that both coil packs should fire when cranking, and that he feels that the ignition module still has a problem.
He says that Autozone can check them, but sometimes, they show up as working when they really don't.
What he has offered is that if he has a test module (meaning an ignition module he knows that works) for our truck model, he'll let us take it and install it on our truck and if it works, we know it's the ignition module that was bad. (He and my dad go back a ways, is probably why he's being so nice as to let us do that).
He says if it's not the ignition module, then certainly the coil pack is then a possibility if only one side is firing.
But, what do you think about this? Are we being told the wrong thing?