I had this problem. Adjust the idle screw at the top of the TB. Its a little bronze one. Open it up a bit, you may have a little higher idle(not much) but the squeek should go away.
Its a Jdm engine but seems to have all the Si components, intake, valve cover, things like that. Its wierd.Tiersin said:it the larger brass colored one. Its a flathead design facing the passenger side if the car on the top.
I guess it would help to know what engine your talking about too.