GMC Savana 1997 5.0 Vortec

I have Savana , 1997, 5.0, 100000 miles. I had service light for misfire. Here what i did: I checked compression which is good, i replaced spark plugs and wires with cap and rotor, i replaced injectors. After i replaced computer with another( bought from junk yard) i installed PROM into this computer and plugged everythink back. Started engine no codes.Car running like shit, Then i got code 0341 which is Cam sensor performance. Help me please. May be computer bad again or maybe crank sensor? I also replaced cam sensor and still i get this 0341.
Car is shaking. Thanks guys. :naughty: :banghead:HELP!!!!!