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2020 520 rubicon foot shift
854 Posts
Does it use oil? The plug looks oil fouled not like one that running rich.

If you want to check the plugs color you need to put a new plug in it then run it wide open down the rd, stop and look at the plug.
Looking at the plug out of a high mileage motor doesnt tell you much, if it's running rich, you dont know if it's rich at idle or wide open.
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