As jruppert said, check the cap and wires. The cap will get light film of dirt, and this seems to collect moisture, causing arcing, thus a misfire.
When plug wires get some age on them, the insulation absorbs moisture, again causing a misfire.
Dirt on the porcelain of the plugs get dirty and allows an arc, thus a misfire, especially when wet weather occurs.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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