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Are you concerned with correct restoration ?
If not - you can pick up a large valued cap at Radio Shack - or other electronics outlet. Just be sure the voltage rating is over 20v, and get
the largest value they have that is reasonably sized. The + side to the positive side of the coil - and the - side to ground.
Are you sure it's this - and not EMI from the spark plug wires ?
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:seeya