1991 gmc fuel problems

350 engine and auto trans. I checked fuel pressure.It is 13 pounds. it will start sometimes and run for about 5 minuets and die. when it wont start it is getting no fuel out of injectors. I rebuilt throttle body and replaced ecm and still same problem. also replaced fuel pump relay.does anyone have any ideals. it was throwing a code and battery went dead and didnt get code checked.

was a bad modual in the distribriter. thanks for all the help anyway.