If anybody is interested, I just found my original 1979 trouble shooting manual. It is awesome! It explains all sorts of potential problems and explains what the trouble might be with clear charts and photographs describing how to fix the problems. I need a new scanner before I can send the whole thing out, but if anybody has any questions I can easily consult my manual and photograph the appropriate pages for you. It works. It's for a 79 2.0 with fuel injection, but it has other stuff that might pertain to older buses with carbs.