1994 Chevy Impala I need some advice.

Engine Performance problem
1994 Chevy Impala V8 Two Wheel Drive Automatic 190xxx miles

I had this problem where I would be driving along then all of a sudden the car would die but I was able to restart the car immedately after it died. We played this game for about 3 weeks before it wouldnt start at all. At first I thought it was a vacuum problem so I checked all the vacuum hoses and replaced a few of the hoses, egr, egr solenoid switch, pcv valve, fuel filter. And still the car wont start. I know the car has fuel pressure and the fuel pump works. The only thing that I can track down is the distributor. I have been told that the distributor or optispark is a bad design and usally go out a lot. I am hoping for some insight. Anything will help. Thank you