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I've never done a smoke test so maybe someone else can chime in on that. A smoke test
might be useful to help find a vacuum leak but doesn't eliminate it as a problem.
It takes a little "finesse" to center the IAC motor back into the intake seal (good to replace that as well) so hopefully you didn't add a vacuum leak there, and hopefully you didn't use carb cleaner on the IAC.
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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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