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Old 07-08-2011, 03:56 PM   #51
Chevrolet Customer Svc

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Drives: GM Vehicles
Join Date: Jun 2010
Location: Michigan
Posts: 9,328
AFM is the Active Fuel Management system on the vehicle. Sometimes when it makes it's change over from the full 8 cylinders to the 4 cylinders it can cause a vibration in the vehicle which is what some SS owners may be experienceing. I hope that answers your question domano 68.

Jeff Morris, Chevrolet Customer Service
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