Engine do not start- got spark and fuel pressure

Hi, I've got a problem. My car's engine just stopped during drive and there was no spark. So I decided to change distributor and computer. After that car started and was running on idle for 3-4 minutes. Then the engine started to slow down and finally stopped. So I checked the spark, fuel pressure, compression etc. It looks ok but it still doesn't start. Previously the computer was faulty. Replacing of it solved the problem. Now my mechanic do not know what to do. Is it computer again?