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If you don't feel you have ruled out vacuum leak then I would go back to that. Check as much as you can again, intake boot, hoses on back of manifold, brake booster lines, DISA o-ring(I'm assuming you replace it?) purge hose(front of manifold) etc. You could try a smoke test, I've never done one but looks like it works pretty good.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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