I never updated this thread last year after getting the Suburban back on the road, so here goes...
Had it dyno tuned locally here in south central Kansas. I thought he did a great job on the 1st pass. 385ish rwhp if I recall. He was having issues with the fuel pump control module not commanding enough flow to take advantage of the L9H injectors. The plan was to address this issue by either having it reflashed with for the larger injectors or replace entirely, then strap it back to the dyno for another round of tuning to get if fully dialed in. It ran and sounded good, but could have been better. Low end power needed adjusted a bit more and as well as lope. Occasionally it would start and die or when pulling out of a parking lot or similar, it would die when coming to a stop. Not all the time, but sometimes. Fuel related for sure.
UNFORTUNATELY, that never came to fruition as my shortly afterwards, I filed for divorce and the now ex-wife took the Suburban with her. I tried multiple times to swap her vehicles so I could wrap everything up on it, but she refused. Almost 25,000 miles and a year later, she's still driving it as-is. I hoped to have a dialed in success story to share last year, but failed. It's a good story, just not the one I'd hoped for!
Just picked up a 2010 Yukon XL Denali with a #7 AFM lifter failure at 143K miles, so getting ready to tear into that. I'll have more time to get it as close to perfect as I can before giving it to my Mom and Stepdad to replace their 2006 Suburban with 290K miles on it!