I have the electroair ignition on one side and am having premature spark plug failure (<100 hr on several plugs). When I test these on a regular spark plug tester, they seem to spark just fine but I notice they are sparking/shorting in the barrel of the plug on the tester. Brand new plugs do this a little bit but not nearly as much. The question is whether this is a valid way to test these plugs with the wider spark gap. Of the plugs I removed from service because of apparent failure, I notice a brownish discoloration of the ceramic around the lower end of the barrel. Also not sure if this is significant. Input from others with experience or advice appreciated.