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Intermittent spark can be caused by a bad wire or connection, but most likely if it happens only after the car is warmed up, the coil or the CDI box. Intermittent problems can be hard to diagnose, as you can only troubleshoot while they are not working.
Do you still have points? Do you still have the stock Bosch CDI? Stock coil? How long has it been since you did a complete tune-up (wires, plugs, cap, rotor, points, etc.....)?
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Rex
1975 911s and 2012 Range Rover Sport HSE
1995 BMW R1100RS, 1948 Harley FL
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