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I have a 2001 mustang gt and i sounds like it has a vacuum leak and it goes in and out I tried to find it before and couldn't find anything but yesterday I found out where its coming from I guess it's some type of a valve right in front of the throttle body its rectangle and about an inch tall and 2 inches long. It sounds like it's opening and closing but I have no idea what its called and I'm guessing it not suppose to sound like that If any has had this problem or knows what it is PLEASE let me know.
If you look below step 11 you will see a black rectangle box that attaches to the throttle body in the corner of the pic thats where the sound is coming from
Have you done the rev modd by changing your gasket in your IAC ?? Which is what that black box is connected to. If so then i believe it should sound like that and its not a leak