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That's the vacuum solenoid pack; it mounts to the factory valve cover.

It does EGR / Evap / A.I.R. control (each solenoid does one of the three functions, hence the three solenoids).

Switches vacuum or atmospheric air into each vacuum circuit, to control the flow of the controlled item (EGR on/off, EVAP on /off, A.I.R. manifold or cat injection of air)

RwP
 
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