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The car has 120K and displays DTC P2179 lean on start bank 2...makes a popping noise-like an intake backfire--for 10-15 seconds with rough idle on cold start...runs ok otherwise...any ideas??
 

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2009 CTS 3.6 LY7
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According to my 2009 shop manual dtc2179 is 'lean at cruise', not 'lean at idle' (which is dtc2189). Either way could be a lot of things related to improper fuel delivery and/or vacuum leak. Also could be 'skewed' MAF sensor or maybe O2 sensor. Former might not show MAF dtc but latter should also show O2 dtcs. I would look for vacuum leak, beyond that may need scan tool for detailed diagnosis. Good luck.
 
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