It is located on the firewall right behind carborator.
If you buy a carburetor kit (gaskets, needle&seat, check ball, accellerator pump, etc) it will (SHOULD!) come with a full diagram and instructions. Didn't Mitsubishi use TBI injection in 91? Not sure. If it's TBI injection, it's a whole different story.
I have attached a link for the 91 B2200 vacuum diagram, it should be almost the same. Mazdatrucking.com is a great resource with lots of info on repairs.
facing the car it is on the bottom right side. Turn the vavlve counter clockwise and pull out.
In a Fisher body manual for theat year car probably from AUTOBOOKSONLINE.COM
See them below-
bad retractor
Yes.
No, it has a throttle body fuel injection system (TBFI). It may look like a carburetor but it is not. The injector is mounted inside the throttle body that looks like a carburetor.
Toyota ae 91 4AF Vacuum hose diagram
If it is a FWD configuration 3.8 V6, then yes
The intake rear...next to Alternator...This is what I have found out.