Intake Manifold Cleaning and Inspection - Upper

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

Clean the upper intake manifold mating surfaces.
Clean the upper intake manifold.
Inspect the upper intake manifold for damage.
Replace the upper intake manifold as necessary.

Fig 1: Cleaning And Inspecting Intake Manifold
Courtesy of GENERAL MOTORS CORP.