Quick history:
Broke bolts trying to replace thermostat.
Broke "back out" bit trying to recover bolts
Bought used manifold on ebay as it was cheaper than trying to recover bolts
New (to me) manifold had all the same numbers
decided to change the plenum while I had it off
(had a few issues that are not not relevant to my question.....)
Installed, drove around the block, all seems well

Question:
The new manifold is identical to the old one with the exception of one extra port on the passenger side. Should I cover this? if so, with what? do they make dummy covers for empty ports?

Thanks

 

Extra port for what? Can you post a pic?

 

Here's a pic

 

PCV valve
http://ww2.justanswer.com/uploads/Mo...eenshot087.jpg

 

My original manifold didn't have this. So I have nothing to connect to it. The question is, do I leave it open, or cover it?

 

If your truck does not use the additional vacuum line I would plug it. Right now it is acting like a vacuum leak. A cheap fix is a short piece of vacuum tube with a like sized bolt to act as a plug or buy something like these at your local auto parts or hardware store http://www.autozone.com/fittings-and...nt/125932_0_0/

 

Thanks.

 

Yep, plug it. Call it a day.