Hi – Checking in to see if there was any solution to this problem.
We finally picked up our 23 Denali XL after ordering 10 months ago. Vehicle came with 3 miles on it and we still have under 100 right now. When slowly accelerating (like you would on an average suburban street) there is also a shudder coming out of 1st gear or maybe 2nd depending on how much throttle is given. It seems like its hunting for a gear and then jerks when it finds one. Not sure if we need to break this in further or we have an issue.