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Why is my 1990 Buick Park Avenue when car wont start then when it do black smoke

(1990 Buick LeSabre)
in Highland Park, MI on March 26, 2017
coming out out tail pipe i had a massive air flow sensor put on and a crank sensor at times it wont start and when it do i have kept gas paddle to the floor until it stays started.can u help?
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flooding out it may need plugs wires ... tune up
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flooding out it may need plugs wires ... tune up
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