does the engine have any vacuum leaks? e.g. the smaller breather pipes connect to the manifold which has high vacuum when idling, leak there will cause uneven idle.

MAF in good condition?

any check engine light?

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)