Electrical problem
1991 Pontiac Sunbird 4 cyl Front Wheel Drive Automatic 100000 miles

my 91 sunbird has had this problem where it will be driving just fine then will die n wont start for a couple hours...even days. we hooked it up to a computer it told us the fuel pump was bad so i changed that, next it was the fuel filter changed that, then it said it was a relay i changed that n all the fuses r good and in there right places but it wont even start now? i dump some gas down the air cleaner and it started right up then died. could it be a pressure regulator of injectors maybe??? idk help me please