1996 Plymouth Voyager intermediate miss

This started aprrox 6 months ago with a miss very seldom. However in the following months has gotten worse to the point it is no longer driveable. It started out it would not present a code, and of course it would not act up with mechanic and scanner present, lately the codes present loss of cam sensor, loss of crank sensor, loss of ground to the computer or faulty computer. And speed sensor failure, and upsteam oxygen sensor stick in middle. Now I had extra parts from a parts vehicle that was wrecked and run fine. So I replaced complete disturbter including cam sensor, a complete tune-up wires plugs cap and rotor, crank sensor, grounded motor to body and grounded computer, and then replaced computer, check fuel pressure at 50 psi, replaced output speed sensor, and replaced timing belt and water pump