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Boost leak. Have you checked for any? If your leaking your not going to build pressure.
Looking it over, I dont know how you can really test for a vac leak, I know on the DSM's you just made your own to build pressure and listen for leaks.
Another way to do it, is get some soapy water, turn the car on and see if you can see any air come up while at idle. Also do you have a guage? Is it reading normal vac?
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