My #4 cylinder started to misfire a few days ago, so I decided to replace the spark plugs. When replacing the spark plugs, I found there was a significant amount of oil in the #4 spark plug well. After removing the old spark plug, I soaked up the oil in the well and installed a new spark plug. After installing 6 new spark plugs, and driving down the block the engine continued to misfire. Does anyone have any ideas as to why there would be oil in the spark plug well? What are some things I might need to try to get the cylinder to fire normally?