Dynamic Fuel Management woes.

[MTY55]

I'm driving a 23 Denali  with a 5.3 10spd. When I'm driving in town in the 25 to 40 mph range, and between 1000 to1500 rpm. I get an annoying low grade vibration and drone sound when it drops out of V8 mode. Sometimes when it drops cylinders and transmission at the same times I get a pretty hard shift and shudder. I was at the dealer the other day and they told me this is pretty much a common occurrence for these newer models. Previously I had a 20 SLT 5.3 10 spd with DFM and that one went through the transition seamlessly I never even knew it was happening. I was talking to a guy the other day he has a 5.3 in an Elevation and he is experiencing the same condition. Just inquiring if this is a widespread flaw in the system. 

Edited March 17, 2024 by MTY55