91 Sentra stumbling on acceleration- another question...

Looking for a vacuum leak still- i found a tiny solenoid that has vacuum connections to the charcoal canister, to the throttle body, and the egr control - is there a test procedure for that one? its really small and i dont know what activates it- but it may be the source of the LEAK- any suggestions on troubleshooting?? thanks. PS- i replaced ALL small vacuum lines and checked the brake booster etc for leaks- found none.

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robbie
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