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Everywhere.....OK that was a smart-aleck answer. But actually you do need to check the entire vacuum system to find the leak or leaks. You might want to pick up a MiniVac tool to assist in the testing. I would visually inspect all the lines and rubber connectors you can find to see if you can find any obvious problems. Start in the engine compartment and trace the vacuum line starting from the vacuum pump to where it goes through the firewall. You can use the MiniVac to test various lines to see if they hold a vacuum.
 
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