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Black smoke is an indication of an overly rich fuel/air mixture. This can be caused by many things. On a 20 year old car I would start by replacing all spark plugs and plug wires. Then inspect all vacuum hoses for cracks or tears. Replace as necessary. See if that solves the problem.

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Q: What makes a 95 lumina 3100 start chugging and black smoke after 50 miles?
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