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· Ludicrous speed! GO!
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2,559 Posts
I think fluttering = compressor surge = stuck closed bov. I'd stop boosting it if I were you until you replace the bov.
 

· Always playing catch up
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2,058 Posts
does it sound kinda like the 3 stoogies when you let off? (woo woo woo....) or one long whoosh?

<l><l>
 

· Registered
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2,895 Posts
well first check to make sure the BOV isn't toast

what are you running for boost pressure, low pressure will likely cause a flutter. As for vacuum source, tap a nipple right off the intake manifold and run a vac line to the bov (assuming you've ruled out other sources of the problem)
 
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