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Q: 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
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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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