Whistling noise coming from throttle body area???

I have the BBK duals on a Edelbrock Performer Truck EFI and there is a whistling sound when accelerating coming from this area:



Any ideas?

It's a 1996 Bronco.

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Sounds like a vacume leak check all vacume hoses around efi I had same on a 90 351 after some work look behind toward firewall where two or three small hoses come togather

mine did that for 2days, it drove me crazy becasue i could not find the culprit. you would only hear it at low rpm/idle and it sounded like a fanbelt whistleing. i did trace it to the intake/TB, but then the noise stopped itself. im still cerious though.