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I’ve currently changed crank shaft Position sensor, pcv valve and spark plugs and the rough idle sputter out still persists, is there anything I can do outside of new valve cover gaskets to get this problem to stop?

Changed the plugs today and found oil on one of the coil packs what could this mean? A valve gasket leak? Or what would make there be oil on one of my coil packs?

Just purchased a 1998 Mark Viii LSC with 89k for 3000, I’m having problems though the car runs great when cold but when it warms up and you shut it off it doesn’t run smooth it idles real rough and will sputter out. I read one thread and the guy had a 97 with similar issues he changed his...