Quote Originally Posted by Gambit View Post
Am I off base with the valve cover gasket and thinking it is leaking?
Yes, the O ring around the spark plug tunnel is leaking, but doesn't normally cause an issue until the tunnel fills with oil, over the top of the spark plug boot and prevents a good connection.

Ideally, all the spark plugs should be in the same condition. If a plug looks different, there is a different condition occurring in that cylinder than the others. All of your spark plugs look different. I'll say it again, when you pull the valve cover, check the valve clearance. Nowadays, with hydraulic valves and computer controlled variable valve timing, it would be very easy to overlook the valve clearance as a culprit. And, just because the injectors were cleaned does not mean they are working properly. You need special equipment to check the injectors for proper operation. RockAuto has a couple of vendors that offer injector rebuild services or you could look for someone in your local area.