You stated this happen when the vehicle is slowing to a stop . Does this occurs around 25 mph ? If yes you are feeling the MDS system and if you aren"t sure drive with the tow/haul mode on to see if it stops . The MDS system can engage at speeds as low as 8 mph so what you could be feeling is your truck running on 4 cylinders .
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With A/C on the idle is 625-650 RPM.

With A/C off the idle is about 575 RPM

With the A/C off and the transmission in neutral the idle is 575 RPM.

We have the HEMI and it is very smooth, no roughness at all.

 

It's nothappening when I am slowing down for a stop. It only happens when I make a complete stop.

 

Thanks for taking the time to check!
I had a smooth ride on2/14 because my vehicle idled at 600 rpm (w/o A/C) all day while stopped at lights but today it's back to 500 rpm. I don't understand how that happened butI plan to just driveitback to the place where I purchased it from and just allow them to see what's going on.