@Masospaghetti--- The dealer should be able to tell you if the programming update has been done, unlikely that it hasn't. If the IAC controls the tip in throttle then I would buy a new IAC motor, good chance someone has used carb cleaner and the o-rings are swollen and dragging a bit.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)