Question about 1991 Pontiac Firebird

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Stahling firebird i own a 1991 v6 firebird and it was running great just until like a few weeks ago, i havent done much to it to solve to problem but when i give the bird gas it will go but if i give it too much gas it will stahl almost like its flooding but idk really, and everytime i restart it the first couple seconds a black sutty subsance comes out of the exhaust and after a couple restarts after stahling it now has a loud knocking coming from the what it sounds like the lower bottom part of the engine, any ideas whats goin on and/or what i should have done?

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  • gadgetboyj May 11, 2010

    Sounds like it could be something clogged because black stuff is coming out the exhaust.

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