318 has developed a miss?

krazykuda said

Run it at night in the dark, open the hood and check the spark plug wires for any arcing. It will be obvious in the dark...

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That's a good idea to see if you have some spark jumping around. I would also suggest putting some water in a spray bottle and lightly mist the cap and wires when you do this.

Don't soak them, just a light mist.