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Service Engine Soon light on 1992 Chevrolet Blazer

When my truck idles for a few minutes, the Service Engine Soon light comes on and will not go off until I shut off the truck. What would cause this?

Asked by for the 1992 Chevrolet Blazer
This is the Check Engine Light, and there is background on what why it comes on and how it behaves here: http://repairpal.com/check-engine-light
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This is the Check Engine Light, and there is background on what why it comes on and how it behaves here: http://repairpal.com/check-engine-light