Whether the problem is weak spark or bad fuel delivery, the starter fluid will help it start. The fact that it keeps running and also will start the next day makes me think your fuel delivery is OK.
I'm no mechanical genius either, I tend to fight my way through these problems, but you can usually isolate it with a bit of playing like I suggested. Fordlords mentioned the fuel shutdown solenoid, could it be failing or have a bad connection? Maybe the points need to be replaced?
I think if you stick with it you'll solve this problem, be patient and try a few things and report back what you see.
I'm no mechanical genius either, I tend to fight my way through these problems, but you can usually isolate it with a bit of playing like I suggested. Fordlords mentioned the fuel shutdown solenoid, could it be failing or have a bad connection? Maybe the points need to be replaced?
I think if you stick with it you'll solve this problem, be patient and try a few things and report back what you see.