First off, yes I'm sure it's the plug. Apon looking at the plug after use it looks "melted" but still glows a little. I have tried 3- OS 8's, 2-OS A3's, 2-OS lc3's and 1-FOX plug. None of them lasted longer than one tank of fuel, most not even half a tank. They were all brand new plugs as well. I'm REALLY stumped on this one.