Believe you are referring to the plug on the intake manifld directly adjacent to the alternator. The plug ( about 1 to 1.5 inched in diameter) has in its center the nipple for the vacuum elbow.

It happened to me and the loss of vacuum made the vehicle most difficult to get home. I was accelerating onto the tollway under heavy boost when "bam" it blew and the engine ran rough and I had minimal braking power due to the loss of the vacuum. Bad situation - glad it was me driving and not my wife.

I actually bought a new part from the dealer for a few dollars but never used it.

Here was my solution which has worked for over 2 years. I used and long screwdriver/prybar to pound the original plug back into the manifold. Then I smeared old reliable JB Weld around the surface. Ben fine ever since.

You may need to reset your ecu codes as the loss of vacuum can set off lots of faults.

Let me know if you need to know more by posting back I'll try to help.

Nate B