An oxygen sensor that was going bad caused something like that to happen with my car. It would work for a while, then it wouldn't and the engine would lose power. I'd turn the car off for a while and when I started it up again it would work for a while, then it wouldn't and the engine would lose power again. Diagnostics didn't detect what was wrong in the early stages of malfunction. After it got worse the diagnostics pinpointed it.
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