The MAF is reading 1# per minute (7-6grams per second) at idle.
If I just touch the gas a hair at idle, the LTFT will move closer to 0. STFT will not.
Wideband agrees with O2, 16.5 to --- reading.

It's a LT1 MAF, not sure how else to test it.

My WOT make the LTFT dead on zero (OverKill tuned pcm)