I will say I basically had the exact same issue - is yours intermittent or on every start? Mine was very intermittent and only happened under certain circumstances (upon cold start very rough running and threw misfire and ran on 5 cylinders. Restarted car and was perfectly normal!)

I have replaced the following
-SAP line and vac lines between SAP and manifold
-vac lines from intake F connector
-vac lines behind manifold
-spark plugs (NGK iridium used) and oem Delphi ignition coils

I haven't had a reoccurrence since, although I also have avoided the situation which usually made it come up which is an extremely low run time on cold start (2 mins or so) and then shut down - think starting the X to pull out of the garage to wash the car then pull in when done. When I used to do that it did happen quite frequently when going to start the next day. I think upallnight said to avoid that since it can flood the cylinders quite easily.

Hope that helps

__________________
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