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2004 GMC Envoy Question: check engine light on Told it is airflow problem What does this pertain to?

 

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janrea, 4.2L 6 Cylinder, Shelbyville, IN, December 21, 2011, 11:17
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Just had car serviced came home and light came on.Was not on before it was serviced. Could it be something they did on did not do when it was serviced?

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