Thanks for the replies Jim & T.O.M: I did think about the plug cap being on correctly, as I did remove and replace it when I changed planes to check the plug. It is snug to the plug itself without wobble for a lack of a better word. The plug is what came from from Brillelli and has 33 flights on it. It's a NGK-CM6. When I get a moment I'll check the cap fitting again. The only other wire is where Scott installed it and it goes to the module. I think it's sensor of some sort. Scott does say in his directions that this may have a McDanial lock cap on the plug wire, but I can't get it ot lock when I installed it. It only twists. Again, thanks for any help in this matter.......John