I could not get the link to work, but thank you for the reply. I removed dist. cap & rotor and gold casing on top, the optical looked clean of any debris. Did not see any kind of discoloration on the silver disc either. Pulled spark plug from #5, it is a darker color with a bit of white in it. Pulled the #5 injector connector and hooked node to it. It is working properly. Not sure how to check injector without pulling it. Running B-12 through it. When you pull any other wire you can hear the engine stumble, but when you pull off the #5 wire, the engine really does not change.