This morning it ran just fine, not a single hiccup.

I'm gonna check the grounds this weekend. It beginning to sound like a flaky electrical issue.
Anyone got a diagram as to where all the grounds are located under the hood and on the block?

FINALLY!
So I've made some progress.
The stock radiator cap was shot, which was causing coolant to leak when it was under pressure. (Big puddle in the garage)

Also found out that the TPS wiring harness had a short in it. Right where the wires enter the blue rubber of the harness they were twisted and bulging. So I pulled it apart, hooked it up to the laptop, and jiggled the wires around, and sure as shit, the TPS readings in datamaster started going nuts. So I pulled the harness pins out, cut back the wire that was damaged, and resoldered them back together. The TPS readings are stable and reading at 0.0% and .57mv.

Thanks to the new vacuum line kit from GM, the car can do WOT runs now without blowing the Throttle body vacuum lines out.

The car runs 100% better, and the TPS wire fix also cured the car of a strange stumble while driving over 45mph in overdrive.

But unfortunatly, this isn't where the work ends. The car needs new struts in all 4 corners, and new strut mounts in the rear. The drivers side window motor needs a serious overhauling, and it needs new tires as well.
Anyway, thanks for everyone's advice!

Luke...

What are the proper voltage/readings for the TPS that should be seen in logging software? 8)

It should be exactly what I have now.

0.0%  &  .57mv (or slightly less)

0.0% = .57mv

What is 100% = mv?

Just looking for the full sweep voltages... 8)

100% is 4.5mv, I think. I know it's close to 5mv, but not quite.

k...thanks man!

8)