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while replacing my valve cover gasket today i noticed there was a vaccuum nipple with nothing attached to it and no obvious disconnected vaccuum lines. Can someone tell me what this is?
Coil Motor vehicle Automotive tire Electrical wiring Automotive fuel system
 

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That's your egr solenoid. I'm not exactly sure what it does but that's a search term for you. That open port should have a line that goes to a fitting near the back of your intake manifold. On the side but near the back four or five inches up from where your spark plug cables come out your distributor. At least that's how it is on my 91
 
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