that might be it, but double check the vac lines behind the intake under the cabin air filter housing. If you moved that around when removing intake, they get dry rotted and crack pretty easily. Remove the panel the cabin air filter housing screws into to make access easier...that is, if this stud doesn't fit the issue.
Debut Radio Show Tuesdays from 1-2-ish p.m. EST on Hamiltonradio.net The Mechanical Animals
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A recent set--NSFW audio: https://youtu.be/_dcxcZfD6dg
Mangofy your E46!