not automatically shifting.

is there a way to test for this other than switching out the ignition switch for a new one?

Years ago before the dealer here knew what the issue was, I had to find the problem. While testing, I found the circuit to the cluster and the transmission would quit, not allowing the power to reach the transmission, and the shift solenoids. You can test the circuits as well if you would like to.

any chance this would account for my high idle speed as well?

Not necessarily, that could be from a vacuum leak, or maybe a bad IAC just to mention a couple of things. The ignition switch is not really that hard to do, and no reprogramming to be done, the key lock and cage stays on the truck, just the switch is changed.

great. thanks for all the help.