Made it home. I set the truck back to stock and everything cleared. Couldn't reproduce the conditions or the problem. I thought it was going to be a probe but I drove the last 115 miles home without a problem. When the problem happened, Pyro 2 was all over the place jumping to values anywhere between 0 and 6000+. I was pulling some moderate hills at the time with the cruise control set. I wonder if the probe starting acting funny after it got over a certain temp. I only got it up to 1060 once on the way home. The hills that I had the problem on where much larger than the one I hit 1060 on.
I'll mess with it more once we get unpacked or sometime this week.
Might be time to pull some piping out if the shed.