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It could be a bad oxygen sensor or the wiring to the oxygen sensor. This is not the only possibility. Could be a computer issue. not sure what else.

If the spark plugs and O2 sensor are all black, then the injector may have failed.

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Q: 1991 dodge shadow 2.2 auto What would cause the mixture to be rich The problem im having is black smoke and Im guessing fuel and you have black dry soot on your plugs and very poor gas mileage?
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