How fresh are your spark plugs? If you have a leaking valve cover gasket and the plugs are sitting in oil I'm sure that wouldn't help your idle.

Also have you replaced that 15 dollar intake tube ever on your car? 3.0's are notorious for them tearing and causing a vacuum leak/idle issue.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards