P0171 code vacuum leak? - Mustang Evolution

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Old 08-08-2013, 01:53 PM   #1
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Join Date: Sep 2012
Region: Illinois
Posts: 111
Hey guy as the title say my car threw this code 2 days ago. Running lean bank 1. I check my cai for any intake leaks at all, none. Check for blockage anything and it's good. I saw a thread here that azure talked about idle relearn. My car was idling about 500-600rpm so I did that and it cleared the code but came back today. My family mechanic is pretty much certain it is a vacuum leak and I'm getting my car to him tomorrow I was just curious if based on what I saw you could see any other possibilities such as maybe an bad intake gasket or something else, thank you

Edit: I should clarify, my only symptoms I have noticed is the low idle rpm.
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