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Is your car North American or Euro? Tiptronic or manual?
As a 1998, it should have vacuum from the plenum boot to the fuel pressure regulator.
If it's North American, should have a second vacuum source with a black and white check valve going to the secondary air injection system. If it's Tiptronic, that vacuum source should also go to a valve for the transmission heat exchanger.
It should not have the second cross-tube and resonance valve that is shown in many diagrams (for the 2.7L and 3.2L engines).
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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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