Well, after much dismay, I've found what is causing the ECU malfunction. I took apart the unit, and after fiddling around with it, I saw a black crud on the wiring harness connectors.

ANTS!!

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Check out the upper left hand solders:
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Closeup of same picture:

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ECU Mounting Plate with circuit board removed:

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So, I guess that the lesson learned here is be sure to spray your truck for ants and bugs. A $3 can of insecticide could've saved about $300 in repairs...

My ECU is off to the repair dudes via Fedex 'cuz a couple of ants nested inside it...I hope someone gets a good laugh outta this one, I know I did... <img src="/forums/images/graemlins/kewl.gif" alt="" />