When engine stops, the tach surges back anf forth from 0 to max rpm for a minute or so, then stops. Sometime is there is a very faint "thud" when the tach stops surging (and this is with the engine, fan, and everything else completely off). Car usually restars after a few minutes or so, with a very mild backfire, suggesting accumulated fuel. Took to my ususaly excellent shop and they plugged in diagnostics and drove for a week and could not repete the fault. No diagnosis given. When the random engine cut out happenes the "check engine" light is on. Read various comments like this but no one mentiond the mystry tach surging or mild backfire on re-start.
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