Well, Chevrolet was able to tell me that the computer(s) are all OK. They said they fixed it during the diagnosis and it rode right for two miles. Then went nuts again. I fooled with it till 9:30 last night. It was running perfect. Get up this am. Wont even start. Just makes weird noises and a slight thumping noise through the stereo. I wiggled harnesses and made the noise get faster. That's it. Had it towed to my usual shop. They are pretty good mechanics. I have never seen anything like this. So frustrating. I'm afraid this things about to be towed to the U-Pull-it.