Intake Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Clean the intake manifold gasket mating surface.
Inspect the threads on the retaining bolts.
Inspect the intake manifold for cracks.
Replace the intake manifold if necessary.

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