I'm having issues with my moomba. It has a 5.7 mpi assault in it. It will start then run for a few seconds then die....a few times it has ran for 10 to 15 minutes then shift in gear and give it throttle and it dies. I have drained fuel tank and changed fuel filter with no regard. Also have checked tps, map sensor, and iac which all check good. Also changed distributor which was corroded and plugs which were black. There is also suit in the throttle body and oil in the channel on the passenger side opposite of iac chamber of the throttle body. I am at a loss of what else to check and cannot afford to pay a mechanic right now so I'm hoping someone can plllllease point me in the right direction on here. Oh I also check fuel pressure it is about 55lbs when key is on and bounces around 55 and 57lbs when running. Somebody help a broke man out