I recently bought a 87 supra turbo, so I bought a fresh set of new NGK wires and plugs. I always noticed hesitation when I tried to start the car. So when I was changing the plugs I noticed spark plug cyl. #6 was drenched in oil, and #5 had a little bit, the rest were bone dry. Even with the fresh set of wires and plugs it still hesitates a little bit when starting, so I know the oil has something to do with it. Any ideas on what it may be? valve cover gasket? spark plug seals?