So, after finally getting my hands on the repair manual pdf I was able to use the troubleshooting guide to get to the bottom of the problem with the first truck. Turns out it was a faulty ECM. Got a new ECM overnight shipped, threw it in, accelerator pedal works again! wOOt!
Now that I have the newer truck back up and running I can mess with the other truck and see if I can get it worked out.
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