Gm could have at least suggested it. I would love to put two of the same v6 trucks side by side, one that has the chuggle and one that does not, and run a log or live scanner to see what is the difference. There has to be something that the ECM does differently or whatever causes the hesitation.
Mine was so bad even my wife noticed it while she was driving the truck. She usually has no observations with her car unless there is something really bad going on. I have to take her car for a drive here and there just to make sure that everything works as it should.
I was very close to trading my truck in for a 17 just because of this one annoyance. If the dealer would have given me a better price I probably would not have started this thread.
I think there are two different things occuring but people are assuming is the same thing.
You have the throttle-by-wire initial 'delay' when you hit the gas pedal. This is a one time 'delay' before the truck starts moving. All vehicles I've driving with throttle-by-wire have this delay.
Then, there's the chuggle/stutter issue - which occurs (for me anyway) when the truck shifts into 6th somewhere in the range of 40-50mph. You coast and slow down to below 40mph.....step on the gas normally (for me) and the truck just doesn't downshift. Eh eh eh eh eh eh....... kinda feeling.
The whole 'adaptive learning' thing throws a curve-ball trying to diagnose the issues because of the complexity. We all drive differently, have different types of commutes, lengths of commutes, etc. So - diagnosing for one person or one truck won't necessarily mean its doing the same thing on someone else's truck.
People are coming up with their own remedies - which is better than sitting around waiting for GM. So - even if there was someone willing to literally dig really really deep to diagnose it......would all that effort mean anything to GM? Probably not..... Other than the curiosity of knowing WTF - and perhaps there's a hidden gem discovered? But is it worth the $, time, and extra grey hair trying to figure something out that you won't get GM's support for? Just sayin.....
Personally for me - I'm concerned about the mechanicals. If it is a misfire and/or an issue with the torque converter (or whatever else) - its the beginning of potential failure. When and where will this failure occur? How much of a headache will it cause me and my wallet?