Chatter when accelerating

[busta350]

2021 silverado 6.2 10 speed truck.  I have been having this chatter noise coming from under the truck for a while now. I have brought the truck back to the dealership multiple times and get told everything is fine they don't hear anything.  I know the truck isn't fine I've showed them videos of the rpm dropping to 300 after coming to a stop. The truck has lost power and vibrates a lot. The noise Doesn't happen when accelerating from a stop only once your already moving and apply the throttle. The truck also shifts wierd at times and gas mileage has gone down. 

Edited September 16, 2023 by busta350
Wrong spelling

[SteveP45]

No video

[busta350]

 

 

[Mshawn]

Sounds like your dfm staying engaged!!!