Engine oil on spark plug

What is your question?

Engine light came on - took it to Advance Auto - indicated cylinder 3 - misfire in first 1k rpms. They suggested I change spark plugs. When I removed the 1st plug, it was covered in oil. No oil leaks around valve gasket and no oil leaking from seals. I replaced 1st plug only - engine light went out after driving for a few miles but car stillmisses intermittently when at idle or stop light. How do I get that oil out?