Something to think about: In the past when driving M37s I owned on a regular basis outfitted basically as a "stock" vehicle, I would often add a vacuum reservoir in series with the vacuum system for the wipers. These reservoirs were usually from Saab or Mercedes cars and often be stationed...

A year or so ago a real beater M37 followed me home. I figured that I would use it for parts on some other projects. Of course like anyone else, I had to get it running and drive it around to see what condition the various systems were in. The previous owner had installed a civilian carb and wired t...

Hey Steve,
As others have implied, something basic is wrong. Have you done a compression and leak down test on engine recently?
I think I would start there. If that was a ok I'd go to ignition settings (plug and point gap) and then go to fuel system checks.
Good luck and let us know what you find.