Thanks for your help. One day, when I am experienced at this stuff, I too will be helping. But imagine this: I think Actron's testing device that was used by Autozone on Monday screwed this thing up. Other than the fact that the truck had an intermittent problem with the engine light going on, nothing was wrong. As soon as they hooked the unit up, the truck ran like crap. I pulled out of there with a truck that I was lucky didn't stall in the busy intersection. Let me know if you have heard of these newer Actron devices or service code testers actually messing up the main CPU of a car or truck. Steve