sounds like potentially a BPV problem? Wondering if the SC spinning at idle is not bypassing the extra air and causing the lean condition. Or it could be a vacuum leak post-MAF that is throwing the readings off (i.e. not accounting for all the air entering).
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Car Sold! Pleasure being a part of the Z community. 
New ride: 2015 GT-R - 647 WHP / 641 WTQ (e85) & 543 WHP / 519 WTQ (91)
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