Intake Manifold Bolt Grommets

• The most important thing to check while replacing an intake manifold gasket is the rubber grommets on the intake manifold housing bolts. These are prone to erosion and, if damaged, can cause air to leak from the manifold housing. Replacement grommets can be purchased at auto parts stores and take only seconds to install. Inspect the current bolts and grommets and replace any that appear cracked or damaged. No additional tools are needed to replace the grommets.
  
  

Serpentine Belt

• Since removing the serpentine belt is necessary to remove the intake manifold, inspect it while it is off the vehicle. Belts with excessive lines or cracks should be discarded and replaced. Remember to check the serpentine belt diagram for correct re-installation of the belt after the new intake manifold gaskets are installed.
  
  

Air Filter

• Air filters should be replaced if they look excessively dusty or contain debris.Jupiterimages/liquidlibrary/Getty Images
  
  Removal of the car's air filter housing is required during intake manifold removal and so it is logical to check and replace the air filter while it is out. This is also a good time to check the air filter housing for debris and clean it with a dry shop rag. If excessive grime or debris is present in the air filter housing, dampen a shop rag with water and clean it. Make sure to completely dry the air filter housing before installing it, as introducing water into the air supply can cause engine damage.
  
  

Radiator Hoses

• The upper radiator hose may feel overly pliable if in need of replacement.Jupiterimages/Photos.com/Getty Images
  
  Before disassembling an intake manifold, the radiator hoses must be removed. Since hoses are relatively cheap and often overlooked, replacing them during the replacement of intake manifold gaskets is sensible. Replacing the radiator hoses and, if needed, their clamps, only requires the use of a screwdriver.