Tim,
When the truck gets a code and goes to reduced engine power, the computer is in complete control and you really can't overcome it without shutting it down and restarting. The reduced engine power is a safety precaution of the computer and is not really indicative of a major issue by itself.
You might have a voltage problem and I think a few, maybe even '05s have had the ignition replaced.
I was having voltage problems due to the battery and I would get the "reduced engine power" deal but I would be sitting in my driveway and just couldn't get going.
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