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What PSI spring do you have in your BOV? you can rule out if the BOV is open at idle by just unplugging it (don't drive it), if the idle issue goes away then the BOV is not 100% closed at idle. Also a vacuum leak can cause this issue too. Make sure you go over all your vacuum lines with soapy water or check how much vacuum your car is pulling at idle to verify nothing is leaking.
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