Thank you very much for the help! It doesn't look like that was the answer, but it's one more thing to cross off the list. I made a screencast of the mostly stable readings when connected and the engine being off. I hit the throttle so the tps goes up then down evenly, then I go ahead and start the engine and see all the numbers go crazy. This is using the adx file you shared. The top data point is speed. It was up to 160 there for a second! Ha ha https://youtu.be/MlwmLdQSyC0