If it only whistles when the IAC should be working at idle and at first at low rpm, it is the the IAC passages. (Some other brand whistle, but BBK has sold a lot of them. Top line F#.) Whistling under acceleration does not make sense for the normal issue.
Have you used a stethoscope (or hose to your ear) to verify the location?
I would NOT glue anything that might get sucked into the engine in the IAC passages.