I don't have an issue changing my MAF sensor. I do have a Delphi part number 25168491 black 85mm MAF I can put in, I have the adapter harness for it as well. We should be able to use it with the MAF curve out of an 2001 Suburban with the 5.3 right?
If I make that hardware change, I have a set of D585 coils I'd like to put on as well. I've been putting off installing both parts, so this may be a good break to put them on. These should need the spark dwell table out of a Yukon with the gen. III 6.0.
In the interim, I'll flash your Mod5 tune and get a log. Is it still helpful when I list portions of the tune with/without bucking?