Thanks for all the replies guys. Even though it's my DD, I don't put on that many miles a year, so with about 9K in the last 2 years, I consider my MAF and O2 sensors fairly new,sorry for the confusion.
My AFR is where it should be across all the rpm and load ranges, and the LV is pretty steady,I was just worried about the idle range being so out of whack. No CEL's,drives great,idle is smooth.
Not sure if I can fully rely on a smoke test,so I'm gonna do the soapy water check around the IC/BOV/TGV connections and try the MAF wires wiggle test. All my hoses are silicone with new clamps and zip ties in the right places, so I'm gonna look in some not too usual areas. Can leaking PCV/ breather hoses cause a leak that would make it lean out at idle? I want to first rule out any leaks before I touch the tune,which has been good to me for the last 5 years