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Q:

REPLACING PLENUM AND PLENUM GASKET on 1999 Buick Park Avenue

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When the lower intake gasket is replaced do I have to replace the plenum as well and also the plenum gasket?
(1) Answer
Definitely replace all of the gaskets, but only replace either the upper and/or lower manifold or plenum if they are defective, such as cracked, leaking, warped, EGR system damaged etc.