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It might not be getting enough air. Check your air filter/air system in general.

it could be a temperature sensor there are 2 wires one goes to gauge and other to computer. The gauge can read right but be telling the computer that it is 0 degrees or less mine was -67 degrees and causing the truck to run rich.

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Q: Why is my 1988 Chevy Cheyenne 2500 running too rich?
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