$cr3133. Im in the boat with you on this .
My truck has done this since day one. It now has 9000 miles on it.
I can cover up this problem by driving like the 2016 canyon manual says,
"if you need more power for passing and you are going less than 35 mph push accelerator pedal about halfway down. Going above 35 mph, push accelerator ALL THE WAY DOWN".
Who the hell drives like that? 305 hp on a slick road should be fun. Your passengers will think your nuts. GM knew that this tranny was not totally compatible with this v6 direct injected engine when they wrote the manual. Not enough gears and Ill bet that is a big reason that after only two years with this combo the 2017 v6 canyon is only offered with a 8 speed trans.
The gears are too far apart. Engine is Running at too slow rpm and in too high a gear. so that when trying to accelerate slowly more fuel is going in engine causing engine to bog,chuggle, shudder before accelerator is down far enough for throttle position sensor to signal trans to shift down.
Why some people dont notice this is maybe their driving habit is more aggressive than mine. I dont know.
I have taken it to two dealers. They say it has latest update and this is normal. (B S) i have been driving since 1959 and my driving habits have worked fine on all other vehicles. To accelerate slowly its like im having to shift with my foot to get it to pull smooth.
You can bet the dealers will be aware of this at trade in time and will not want the truck to resale and make another unhappy customer. Oh well, by 60k miles the intake valves will probably be soo coked up that the burned valves will be causing it to miss and chuggle also.
If anyone gets a definite dealer fix, please try to get specefics and post in a new thread, as the answer to the chuggle, shudder or whatever so it can be easily recognized.