Note: if you have unbolted the intake manifold from the block, it probably won't need a new gasket. They have rubber seals that are reuseable as long as they are in decent shape. It does NOT require any sealant to put them back on. The long plastic tube that runs across and through the intake manifold is a vent from the AOS to the PCV valve breather,. While you are there, take a look at the tube to inspect it for cracks. They often become brittle and a crack can cause problems related to an AOS failure.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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