sounds like the gasket between your throttle body and cai, mine does the exact same thing its like a wistle under the hood. I replaced the gasket but it still does it cause i put a round air filter on it so thats my noise, sounds like the same noise u have

 

Try cleaning the iac.

 

My initial thought was the TB gasket too. Seems to be a good seal though.

 

i agree, and if you are not sure on how to or it it just looks bad replace it its only like 45 bucks at autozone. if thats not it, to me it sounds like it could be your serp. belt... Im just saying...

 

Sometimes the carbon an gunk that build-up around the inlet hole can make noise. Good advice on buying a new one. I wrecked one of those things a while back. It doesn't take much.

 

i broke mine too when i went to clean mine... thats how i know the cost...

 

Just got donecleaning my TB and IAC valve. Completely remedied the squealing sound. And my throttle response is so much better too. Beautiful!! Thanks all for the advise.