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My truck when it rains or is damp outside is running rough gives a 304 miss fire

(1999 Ford Ranger)
in Morehead, KY on April 12, 2015
my 99 ranger 2.5 engine gives a 304 miss fire code when its raining or damp outside. I replaced both coil packs wires and plugs,this did not fix the problem.
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on April 12, 2015
Since # 4 is at the rear of engine where water can run in between hood and cowl, check for moisture at that cylinder...Check rubber seal under hood at cowl.. Spray ignition sealer on all ignition componets.. or related componets!
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on April 12, 2015
I also get a 0455 code sometimes vacumeleak.I can't find leak.
on April 12, 2015
That's an EVAP system leak.. Should not be affected by moisture! .. Have EVAP system checked, may need smoke test. Good luck, I'm out of ammo!
on April 12, 2015
OK thanks.
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