1999 Saturn Sl2 Intake Manifold Making Knocking Sound Behind Sensors Knocking

1999 SATURN SL2
143,000 MILES
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the intake manifold is making a knocking sound behind all the sensors. why is the intake manifold knocking? I thought it was my engine knocking but it is deffinitely inside the intake manifold.

changed the MAP sensor (which did not help anything at all)
Nov 20, 2012 at 4:29 PM
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SATURNTECH9
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There is nothing inside the intake manifold to knock so the knocking has to be coming from somewhere else.
Nov 20, 2012 at 6:46 PM
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