Hard Start with random battery issues

I have a 94 with a 3.4. I have the same problem as mentioned before in another thread about the fuel pressure issues but added to that I have problems were the car acts as if the battery is dead and if jumped it will start up ok after a few minutes and a couple attempts. But If I let sit for 5 minutes without jumping it with cables the car will turnover just fine, Still having problems starting thought. I have checked the fuel rail and I have gas. I have changed the pressure regulator, TPS, MAP sensor, and looking to change fuel pump.
Please any ideas. :banghead: :banghead: :banghead:

why were the parts changed??were we guessing,was there codes??
as far as fuel pressure,just confirming theres gas at schraider valve
is'nt good enough you need to check f/pressure with a gauge
if there are codes what are they