Leica R3 Mot

Leica R3 mot. for parts or repair. Seems to only work on some speeds. did not get usable shots from a test roll. Shutter and mirror do their thing mechanically but possible at the wrong time? Light meter also does not work but seemingly different times on auto between bright and dark conditions. Anyway, currently not suitable to shoot a film with it for above reasons. Motor drive seems to work just fine though. Body only, no lense.