It is possible for the wire going to your points to be broken and only touch with vacuum or without vacuum but not both. That is rare, though. Most likely it is as the earlier poster said - idle speed is not set high enough for your initial mechanical timing setting (with no vacuum advance.) You could try raising your idle speed a little before pulling the hose off. Then set your timing, then connect the vacuum hose again, then set your idle speed to your liking.
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