1990 Mitsubishi Mighty Max Q&A

1990 Mitsubishi Mighty Max Question: black smoke

how to correct black smoke coming from exahust system -
Answer 1
. . -
Answer 2
replace mass air flow sensor -
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1990 Mitsubishi Mighty max 4 cyl, What would be the first sensor to check? Already replaced water temp sensor. Same amount of black smoke from cold to running temp. Thanks..B