1995 Cad sls runs for a short time and dies is there a relay that controls both?

Hello, a relay would not likely cause your concern. Testing must be done when the problem occurs. At the point the vehicle stalls, it loses either fuel delivery, spark or has an inappropriate amount of air getting into the engine. Testing will reveal what element is missing, and then continuing the troubleshooting will find out the root cause. Too hard to know without hands on testing.