ok i have a jdm b20 block, jdm b16 head/ tranny. ik just resently bout the car and it ran fine and everything but today when i was driving it started to like misfire or sumten and making it a really rough ride and idle. so i got home pulled the spark plugs wires, and piston 1 had oil in then i pulled all park plugs out and piston 1's plug was covered in oil. im thinking blown piston rings..... so could there be any other reasons why there is oil pn my spark plugs and why is it running so bad.

also i just put i itr valve cover on