what can be causing black smoke to come from the exhaust during acceleration? on 1991 Buick Century

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it just started happening, but only seems to occur when the throttle is pressed, either from driving or from pressing the linkage from the engine
(3) Answers
(2) Comments
that was one of the first things I noticed was the poor gas mileage, that 3.3 was sucking it down like a v8
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