1998 Plymouth Breeze Trouble starting.

I have a 98 Plymouth breeze with around 158k miles on it. It ran fine up until about 2 weeks ago. I parked it over night with it running fine before shutting it off. Went out the next morning and it wouldn't start on its own. Starts somewhat fine with starting fluid and sometimes on it's own after cranking the motor a few times. When it does start it runs really rough for a few minutes. Hesitates when pressing the throttle both when cold and at operating temp. I have replaced o2 sensors and the crank sensor in the past week. Put a brand new fuel pump in last year. Ive checked the cam sensor and I'm getting proper voltage. Injectors are working fine as well. I can hear the fuel pump kicking in when starting so I know the pump is working. I've called garages and all I get is that I'd have to bring it in so they can look it over. Any suggestions on what it could be?