So, what happened was, after driving to a nearby Borders books to pick up some reading material, I came back out and fired the truck up. Right off the bat it was running crappy, running on eveyr other cylinder and not clearing up with a goose of the throttle. Then it'd die. I'd be able to start it back up, but it'd still run crappy and die again.
Went and got a new ECU at lunch today ($80 at Autozone) and hopefully this afternoon it'll be installed and my truck will be running again. If this doesn't solve the problem, then I'm not sure what's causing my girl's ailment!