Maybe it was your ECM????
This happened with my truck. I was driving along at like 65 mph and it clunked, and the truck shuddered and it died. I got it started again and pulled it over to the side of the road and it died again and all my gauges went crazy. Anyway, called my chevy guy, and he told me to restart it and it started fine and there it was, the CEL, dangit. I took it in and they found the ECM went out on my tranny. Just a thought.
