1995 Honda Civic 1995 Civic won't start

The problem started back in late winter when the engine started running rough and I had a check engine light on and it said that the o2 sensor was suspect. I replaced the o2 sensor and the light went out, but car continued to run rough. It ran for a few more days and then one day it just died. I sat for a number of months and I went out and it started up, but only ran for few minutes and died again and has not run since. I have spark, fuel is getting to plugs cause they keep getting wet when I try to start. I can hear the injectors firing when I place a screwdriver up to ear. It will only make an attempt if I hold the pedal to the floor and will act like it is going to start, but never does. I have replaced fuel filter, plugs, and it has a fairly new distributor. Any ideas!