Thread: oil where it shouldnt be...

Today, I was getting a misfire (or knock, who knows for sure) when I was doing a pull in 4th gear past 100mph....
So i pulled my spark plugs and found a little bit of oil on them... on the threads. but it wasnt coming from the valve cover.
So I guess the usuals are rings, valve guides, or pcv line...

Ideas or tips?

I'll pull the pcv line tomorrow to see how much/if any is in it. I changed the pcv valve a few months back when I did the head gasket. And havent noticed oil on the plugs until now....