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Ok, I checked everything over on the car and I'm thinking that it has to be either the headlight switch or the small aluminum check valve. The hissing sound seems to be coming from near the aluminum check valve, but it may be coming from the switch because you can hear the hissing sound underneath the dash after shutting the car off. All of the vacuum lines are securely connected, and in good condition. The vacuum air tank in the fenderwell appears to be in very good connection, too.
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