GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1336129  Size: SH
  1. Clean the intake manifold crossover.
  2. Clean the intake manifold mating surfaces.

  3. Object Number: 1336130  Size: SH
  4. Clean the intake manifolds.
  5. Clean the intake manifold mating surfaces.
  6. Inspect the intake manifolds for cracks.
  7. Inspect the intake manifold mating surfaces for damage.
  8. Replace the intake manifolds if any damage is found.