1993 245 wagon.

Our car is being spastic. It randomly won't start. We thought it could be the coil so changed that out. Drove it 30 miles one day. hopped in to go home and no start , finally got it to start an hour later. It won't even turn over. Then it ran fine for a week going here there and everywhere. Went out yard sale ing. Driving down the road it died on us. No start and ended up being towed home. We pulled it off the tow truck and it started right up? So we changed out the coil. Car ran great for a week. Yesterday drove into daughters house, got ready for take off after a visit and it wouldn't start so we pushed it forward, it still wouldn't start. Borrowed her car for the day came back and it started right up. Any ideas on what the heck would cause this? Where do we even start. We've run the codes , nothing will pull up just 1-1-1 so???? Help? Would a relay that is going do this? Weather climate doesn't seem to matter if that helps it can be hot or cold out.