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Misfiring when wet

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Here in NNY I have a stock 86 MJ 2.5 4sp. The problem it misfires when wet/damp in the mornings. The misfire goes away when it warms up. My fixes so far checked the pinch seam and resealed it (it was leaking), checked for leaking clutch fluid damage there is none. resealed all rubber plugs that go thru the firewall. Each fix I thoght would solve the problem but not yet so I am reaching out for suggestions any Ideas?

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It can also be the plug wires themselves. If the outer insulation jacket is wet/damp and the inner insulation is aged or deteriorated, the wires will cross-fire. Looks pretty spectacular if you pop the hood on it at night ...

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