92 plenum
91 plenum with 92 motor
so iv got a 92 motor 3.0v6 in trying to get put back together but I'm trying to use the plenum from my old 91 motor but there is an extra tube on the 91 plenum that's not on the 92 can I still use it and leave that tube empty? I'm using my 91 wiring harness and my 91 water outlet thing. That in the back of the motor with the temp sensor on it. If that matters idk. Here's a couple pics what do u guys think iv got parts for a 90,91,92 motors sitting here how do I finish this up??

 

I can't tell what that tube is for (I don't have it; the "fatter" tubes on your '92 are for PAIR, A/C idle-up, and fuel return in order from largest to smallest).

But you can just unbolt the set of tubes from your '92 plenum and bolt them onto your '91. Then (I hope) you don't need to worry about it.