2018 Sierra HD sluggish acceleration

[closepointapproach]

Hello, 

 

First time poster... I have a new Sierra HD, has about 1300 miles on it.  I noticed within the last few weeks the acceleration, usually in the 3/4/5 gear range is very sluggish, I can feel something happening in the accelerator but not increasing speed as expected.  After a second or so truck will shoot out of a cannon, so it seems there is a miscommunication of sorts going on there.  What is really bothering me is that feeling I get when I hit the gas, like the truck knows it should be doing something, but just misfires.  I had the 2016 of the exact same truck, never had a problem with this at all.  Any insight would be appreciated, this is driving me a little crazy.  Thanks!  

[avalonandl]

Gas or Diesel?

[closepointapproach]

It is diesel, thanks

[avalonandl]

Take to the dealer, that is wrong- maybe plugged DPF