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If you don't there should be a 1/8"-3/16" hose with a plug in the end kind of dangling or maybe laying on the motor right in front of where the 'puter is parked on the firewall (That should be a hose with vacuum).
Also... Iirc- the emission warranty lasts till 80K miles.... so if you haven't passed that up you could get a (new) dealer to fork out for it.