How do I repair cyl 2 misfire ? on 2000 Volvo S40

engine light just came on yesterday with 80 regree weather. misfire code cyl 2.Happened last year during the summer also. Ran great all winter and not sure why it happens in the warm weather? Volvo s40 1.9 turbo with 140000 miles. ANY SUGESTIONS ?

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1 answer 1 comment
scan test for codes could be bad coil
just removed plugs and cylinder 2 was full with oil. coils were ok. What would cause the oil in the 2nd cylinder spark plug socket? Cleaned all plugs and installed them misfire seems to be gone for now. I would like to know how the oil got into the plug socket, and how to repair so it doesn't happen again. Approximate cost to repair would be appreciated if possible !