I seem to have a problem that is getting worse, I have a 99 dodge 360 4x4 at first it lost power, now when I start it up and hit the gas it dies and stalls out, my fuel pressure reads 48psi. I have replaced the plug wires and distrib cap and rotor.

 

how's the air filter? I've seen motors do this when they dont have enough air... also, have you checked the throttle body? might need a cleaning.