High LTFT 25%

[Cbwrx]

Hello all I recently replaced a motor in a 2000 Pontiac Firebird WS6 it a stock replacement pulled from another one that was in a wreck, I have put BBK longtube headers on it deleted EGR and A.I.R. along with the Cats and rear o2 sensors motor has new spark plugs, new plug wires and a fresh oil change. After getting this done hooked up the VCM Scanner and my Bank 1 LTFT is reading at 25% and is showing it being rich and lean but will go away around 2k RPM, after searching the internet I came up with a few post saying it may be a bad o2 sensor or the connector also could be a vacuum leak I've done my due diligence on both of the scenarios with no resolution, I will attach the VCM scanner log as well any help is greatly appreciated.

Thanks
Charlie B.

[village_idiot]

You most likely have an air leak. If not the intake, then pre o2 on bank one exhaust sucking fresh air in across the o2 causing a false lean reading