tuned an 01 Z06 with a wideband with in 2%, vehicle has Varam, 224R/.581 lift on 112 LSA and on off road pipe using stock manfolds, did SD VE then MAF tune, re-enabled closed Loop, LTFT are showing 15-25% positive down low and 2-8% midrange and part throttle, also getting a Fuel System Lean Bank 1&2 DTC now...someone help me out ? dont have tune file available it's on a other laptop right now...thanx for any help....