I now have a downloadable pdf version of the Mitsubishi 3000gt Factory Service and Repair Manual 1992 through 1996. It covers all models. This should cover most anything in 1991 also. It includes the chassis and Body plus the Electrical Systems manual. it has Multiple Diagrams, Servicing Information, Diagnostics, Maintenance & Repair Techniques, Diagrams, Charts, Schematics plus much more makes this an excellent reference & can be used by ANYONE regardless, If your a complete novice or an expert Auto Mechanic!
This version is a scan of the original manuals saved in pdf format. The download “zip” file is 94 Megabytes. If you need another manual you can probably find it on Ebay. Expect to pay around $15 and wait for it to ship You can get the 3000GT Repair manual here.