1994 Honda Civic wont stay running

Based on what you told me it sounds like you could have a bad alternator and possibly a bad battery as well or you could even have a bad ground connection. Sometimes when alternators are bad your engine will die and you will be able to start the engine up again a few minutes later off of the memory that builds up in the battery but will die again once its used up all of the memory charge in the battery. And you can do this over and over again.
Check the batter terminals and wires and make sure they are clean and not corroded and your ground connections are clean and secure. Places like auto zone and checkers can check and see if your battery and charging system are working properly.
Other then that any more information you have on the problem would be helpful. Good luck!