Coco brown on the upper part of the porcelain means it's rich at idle and cruise. To see WOT you need to look at the bottom of the shell and look at the fuel ring, but I suspect you are rich at WOT too.
Ok gotcha I was watching a guy at the track reading a friend of mine plugs ,he was talking about the ring that you are referring to. Maybe I can get him to take a look at mine , but there Chevy guys not much love coming from them
