93 bronco / Engine dies when put into gear then having problems starting?

'93 Bronco 4x4 351W // Initially i could start the vehicle and have it idle just fine. I can rev it with no noticable issues. when i then put it in gear and apply gas it dies. Then I have a problem starting it. I have to prime it a few times them have the gas to the floor to start. I monitored the fuel pressure off the fuel rail and it is at roughly 39(key in RUN) and at idle is roughly 30. I monitored it during times it faisl or wont start and fuel pressure is still there. Where should i start looking