OK, after disconnecting both batteries, the thing is running normal. I would still like to see if anyone knows WTF that was all about? Also, would you take it in and have it looked at, or not? I run the risk of the dealer discovering my tuner, even if I do yank it out of there. But, if there is a bigger problem, I need to get it fixed. This is the second time in about a month I've had my tranny doing hokey chit. The first time, if I reset the truck to stock, it quit. But, if I cranked the computer up, it would start it again. At the advice of Hypertech, I unplugged it for a week, and it went back to normal (it was doing something different at that point) even with the tuner. Obviously, this time resetting to stock didn't fix it, which tells me it's a truck problem, not a tuner problem. Any7 insight would be great.