The L92 actually had a first and second design.You are sure that 2007-2008 Yukon XL with the 6.2L did not have the AFM nonsense at all?
The first design (few), built prior to April 1, 2006 contained AFM components, but were tuned out from the ECM.
The second (most) design (like mine) eliminated the AFM components altogether.
YesThat 2008 was the last year without it?
If so, that's good news and I can focus on these years.