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What can be causing black smoke to come from the exhaust during acceleration?

(1991 Buick Century)
in Elko, NV on March 20, 2014
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
Displaying 3 answers & 2 comments
Popular Answer
on March 20, 2014
Engine is running rich! Have the fuel system componets and related sensors tested!
on March 24, 2014
I cleaned the throttle body and the MAF sensor and that seemed to help a little bit
of G. T. Service Center on March 20, 2014
Agree with #2, to much gas.
on March 24, 2014
that was one of the first things I noticed was the poor gas mileage, that 3.3 was sucking it down like a v8
on March 20, 2014
Could be anything
Is the smoke grayish white smoke?
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