You have to determine which system was working last when reading the plugs.
It could be the idle system or main jets.
Take it out to an open road/parking lot and get it running in the main fuel system, then shut it down and pull the plugs to look at them. Don't let it idle before reading the plugs, or you will be reading what the idle system is doing instead of the main system...
Make sure that you don't get into the fuel enrichment system (power valve)....