When I took out my vaccum tank between the UIM and intercooler pipe, I noticed this was not hooked up to a hose. Does anyone know where this is hooked up to or if it left opened?

 

Sorry I didn't mean the vaccum tank, I meant that tube that is in the pic without a hose.

 

That pipe is used for automatics only.

 

Take a look at the stock vacuum diagram (first pic) in this thread. I believe your looking at the red one marked "empty pipe". Check the other end of the pipe to see if it's hooked up to anything. If it's not, then you're go to go.

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/vacuum-diagrams-stock-simplified-sequential-non-sequential-single-turbo-749702/