I just noticed that when ease off the brakes just before accelerating I get a slight stutter, it seems as though the idle speed is not high enough - as soon as I add some gas it goes away. Anyone else notice this? I am on the v8 dynamic.
This sounds like the Intelligent Stop/Start. Switch it off by pressing the Eco button (2014 model) or the A button (2015 model) and see if it goes away. But I do feel the "stutter" as the engine is kicking back in because of the Intelligent Start/Stop system.
This is very interesting that someone noticed this. As a Yukon Denali owner as well, it sounds exactly like the engine is completely shutting off on deceleration. I am positive I know that sound. As soon as you give it some gas, it sounds like it "farts" as it fires all the cylinders back up.
I don't know if this is the case, but I know the sound and believe that this is what's going on here. No combustion on deceleration (in easy driving.).
Edit: Though we hope you know that the Eco mode shuts the engine off if you're just sitting at a light. You'll see it on your tach that the engine's off.