Oil in the Spark Plug Well of my Porsche Cayenne

My Cayenne was experiencing severe loss of power and misfiring after about 15 minutes of driving. There was Misfire code for each cylinder and the Dealership believed it was a result of a bad ECM (engine computer module) which would cost $4000 to replace and program.
I figured I do my own work and I was actually relived to find oil in the spark plug wells and Im hoping this is the cause of my engine problems.
Now I need to remove the valve covers and replace the gaskets.