got serial number?
my W.A.G. = bad distributor, or 'bad pick-up' in the distributor.
you waste money by doing only part of the tune up, as the spark will want to 'go somewhere' and when it goes somewhere it should not, you ruin your new spark plug wires by not having a new cap and rotor at the same time to change them.
you DID gap the plugs didn't you?
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