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I just bought a 2008 cobalt ss/tc with some aftermarket goodies. Was enjoying it till the CEL came on for the by pass valve. My ss has a Forge BPV on it. It looks brand new. It works fine in WOT and Red line, but on low throttle and low vaccum it flutters. And it keeps throwing the P2261 code for the BPV. Does this mean I need a tune? Or is something else causing these problems? All vaccum lines are good, BPV is new and supposedly the car is tuned already, but I don't know where to go next. Any help will be appreciated. Thank you.

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