I am working on a buddies 65 c10 with a refreshed 5.3 with a small cam 4l60e no stall from a 2000 suburban DBW doner for engine trans harness and ecm and sensors with 33lbs flex fuel injectors swapped in. I wasnt able to fail maf because with maf failed it wont run. Is they a way to fail maf so i can adjust ve on these early DBWs? Im having issues straight maf tuning and think its because of ve blending, from 27ish% throttle to 40ish% throttle afr goes all over the place and pops out exhaust, over or under those throttle positions its fine while in same maf frequency cells. Attached log (which is extra long trying to get as much data to look at for issue) and tune (which is still in progress). At about 11:07:13 is where it shows the most. I know its still rich but why would it jump around so much. We have swapped a bunch of parts thinking it was mechanical first except throttle body because couldnt locate one locally. Thanks for any assistance.