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Yes, your vacuum is bleeding off the system and until it builds back up the headlamps and wiper door pop open.
There have been tons of threads on this recently! Plus we have the schematics on our web site. You should upload this before the end of the month, they are free to all right now! http://willcoxcorvette.com/repairand...lp.php?hID=280
Search the archives but here is one of the better threads on the entire system.