I just replaced the fuel pressure regulator and I'm working on putting the plenum back on. The problem is I don't know where this one hose/tube goes. It has a 90 degree rubber boot that connects to a saucer-shaped object just underneath the plenum and I just need to know what the other end of this hose connects to. The opposite end of the 90 degree boot is thin and seems to be hard plastic. Please help ASAP, I want to get it put back tonight in time to go to the track.

 

Sounds like you're talking about the EGR. A long stretch comes off the bottom of the TB on the DS front and runs to the EGR solenoid at teh PS rear of the intake. The outlet of the solenoid goes to the saucer shaped thing (your EGR valve.)
IIRC thats how my 92 was. MAF may be different, dunno. You also will have a short piece of hose from the plenum to the FPR. And if you're SD you'll have a short one to the MAP too. And the bog one to the brake booster.
If you get those 2 on right you'll be fine to go to the track. The only other vacuum lines would be for the cruise control and climate controls.
...ed

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Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

Thanks, Ed. I'll get it back together and let you know how I did.