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.
Installation Plenum chamber insulator to the underside of the plenum chamber.
Install the retainers to the underside of the plenum chamber insulator
Close the hood.
Fig 1: Installing Plenum Chamber Insulator To Under Side Of Plenum Chamber