1993 Ford F-150 engine or computer

Engine Mechanical problem
1993 Ford F150 6 cyl Two Wheel Drive Automatic

I have problem with cranking and powering up. We went though the engine Pistion Rings, valve re-set push rods replaced with seals, new lifters. New coil. And pick up coil, plugs and wires, cap and buttion. Tps and iddle control valve on intake. Fuel presure is good, fuel filter is new, removed tank cleaned, replaced pick up filter in tank, pump seams to be good.
Problem hard to start but even when you get started it will not take fuel, skips and bogs down. If you can get it just after the crank you can very slowley bring up the rpms to max fine with just a little skip sound.
I have changed everything but the paint, waite a second I did that also. Can you please give me a direction to go on this problem? Stan