If the two plugs didn't look the same you may have an issue with the cylinder that the plug was more black. If it has a intake valve issue, that would cause the fuel mixture to be off and jacking with the choke would help. It is possible that is an issue with the carb, but being that it runs fine at WOT but not at idle and that it happened suddenly, I'm betting it's a cylinder issue. You can look into it (the carb) if you want, but I don't think your going to find anything. More than likely your going to pull the head on the side with the black spark plug. On another note, it is possible that it is a spark plug issue. What plugs did you use (Brand and number)?
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