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Years ago we had a car that would intermittantly start running rough and overheating. Had all kinds of emissions parts checked. Turned out to be a loose wire in a harness. Hitting a bump or turning the car would cause the wire to move just enough to have a bad connection. I know nothing about mowers but I would check all your wires, connections and grounds possible. Maybe a wire is leaning against a hot manifold and the insulation is melted enough that it is shorting out?
Just wild guesses.
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Joe
See Porsche run. Run, Porsche, Run: `87 911 Carrera
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