I would be more inclined to suspect the cap and rotor as the problem. Especially if they are original. Wires would not be likely to be bad at that mileage and age. Also, if the miss is intermittent, i.e. not every fifth cycle, it would make me futher suspect the cap and rotor rather than the wires. It's likely that only one wire would be bad rather than all of them. Inspecting the cap and rotor might give some indication. If a quick cleaning of the contact points eases the problem temporarily, that would clinch it.
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