dude he has a reason to be upset...
Black smoke is running rich or a fuel issue. Have you looked at the spark plugs yet? That would be the final decision...go look when you have a chance.
If theyre coated black Id concider new plugs, new air filter, timing checked, and maybe a new fuel filter.
Whats your primary o2 look like?
You could always just try good old fashioned SeaFoam.
(I love that stuff!)
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