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Q: running rich (black smoke) on 1990 Mitsubishi Mighty Max

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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