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You pulled a vacuum and then let it sit for a few hours. Have you tested your MityVac tool itself? Will it hold a vacuum for a few hours?
I think the stuff I read said something about the modulator being able to hold a vacuum for a few minutes. If it couldn't, it was time to replace. Make sure you're testing the modulator itself and not the vacuum line connections to it -- mine didn't hold even that long the first time I tried, but it led me to a leak in the hardline-to-modulator connection.
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