Paging Otto to see what else he did besides rebuild the Vanos - that is really weird.

Hows the air filter - OEM? intake with aftermarket filter? cleaned recently?

Maybe he didnt reset throttle adaptations after Vanos rebuild? If the plugs/coils are good and fuel pump/filter is good - Idk

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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