sputtering power loss, lawnmower sound, oil in the spark plugs. on 1994 Acura Integra

I pulled out the spark plugs while the engine was on and all seemed to be electrically okay because the engine died down after i pulled them out. though after i cleaned up the plug tubes and started her up again the oil came right back.

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2 answers
AGREE WITH !3 ANSWER,AND POSS LOOSE SPARK PLUG
leaky valve cover