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The bbk throttle body is known to whistle. I think it's worst right off idle.
You can take it off and use a file or dremel to try to radius the sharp edge off the hole that goes to the idle valve. It will help reduce it. I did that on the one I had. It didn't remove the sound totally...but it did make it a whole lot better.
I second the throttle cable...but check the throttle blade and make sure it's not gummed up on the edges. Maybe it's dirty and sticking when it closes.
You can take it off and use a file or dremel to try to radius the sharp edge off the hole that goes to the idle valve. It will help reduce it. I did that on the one I had. It didn't remove the sound totally...but it did make it a whole lot better.
I second the throttle cable...but check the throttle blade and make sure it's not gummed up on the edges. Maybe it's dirty and sticking when it closes.
