Very well COULD BE that airbox bangin' around in there... the high the revs the more air you're suckin' through it and the more turbulance you're going to have....
Tighten it down; or ... go ghetto to test it and jam a rag or 3 in there to keep it from moving. But make sure it's TIGHT, don't want them to come loose in your engine bay especially while revin'... might wanna test it in Neutral before you pull out as well.
noR
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