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Nice work. Some vacuum valve thingies are intentionally vented, however it's usually fairly obvious by looking at it, and it would only vent the thing getting vacuum (say, the EGR) and not the vacuum source. However, I don't think this one is vented, because it's switching the vacuum source (right?). Anyhow, you could simply bypass the valve - since you know the vacuum path and all the functions of it - in order to see if it fixes the problem you're having.
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