need a little input

1agofst1agofst Posts: 16Member
i have 3.0 merc i/o
there is black smoke coming out of my exhaust and a black crud
we had it out for the first time this year and everything was fine and then the second trip was a no go,it was idling rough and blowing black stuff out of the exhaust,i cleaned the carb since the butterfly was not opening,it is now opening but still have rough idle and black smoke
could it just be bad gas or is it a carb problem


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