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2000 mazda millenia s 2.3 multiple missfire and a knock noise.

hi mazda forum i have a 2000 mazda millenia S 2.3 and i have the code multiple misfire does not show what cylinder only show multiple and what i did was change the spark plugs and still misfiring and i dont know what to do, the spark plug coil they work fine, what i see is that the spark plugs when I took them out the spark plugs they had oil on them and i have a knocking noise by the supercharger i dont know if this is for the same problem with the missfire.
I need help please any suggestions about this and if i can fix.
thanks guys.