This is something I don't have the courage to unplug. It is under the black protective cover with the throttle body.
There is a rubber pipe extending out of the top of the vacuum tree. half inch in diameter. Leads to a silver round thing about 2" dia and 5" long with a connector on one end. There is a second pipe that loops around and seems to T into the air intake pipe at the throttle body.
What's that thing? Has an electrical connector on it.
BTW. The half-inch diameter pipes seemed in good shape on this 1998.
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