1990 dodge tbi 360, dies when I give it anymore than 1/4 throttle.

What is your question?

Just bought a 1990 power ram. Tbi 360, starts runs and idles perfect, put it in drive and lace into it. It loses all power, like if I was pinching the fuel line off. When I let off it comes back but idles high for 10 plus seconds. Has 13-15 lbs of pressure at idle and drops to 7-9 lbs when I hammer on the gas. Changed fuel filter cap rotor and coil, some say fuel pump or pressure regulator on back of tbi, I'm not sure

What makes this problem better or worse?

Letting it idle

How long has your 1990 Dodge D250 had this problem?

Two days going on three