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So i started having another misfire the other day so i figured it was a coil pack going bad. I went ahead and bought a few new packs and just planned on replacing them all. Well i started taking them off and i came to the 3rd pack on the driver side. When i pulled it out i noticed there was oil in the chamber. This is what was causing my misfire obviously but what is causing the oil to leak into the chamber where the plug is?