WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Open and support the hood.
Use J 38778
to remove the retainers from the underside of the plenum chamber.
Remove the plenum chamber insulator from the underside of the plenum chamber.
Fig 1: Removing Plenum Chamber Insulator From Underside Of Plenum Chamber