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I should have mentioned that my engine was also cold, and I never had a CHECK ENGINE light. The battery was (and remains) strong. Honestly, I know next to nothing about engine management systems, so my rationalization may be way off the mark, but since the trouble went away so readily, I concluded that the ECU got its signals from the assorted engine sensors scrambled by the brief on/off cycle, and it took a few days of routine operation for it to find its way back to reality. Or maybe some sensor just got a temporary twitch.
dcb
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