P1345 CHEVROLET - 2001 Astro

Question

2001 Chev Astro, AWD, V6, 4.3L. Code P1345 plus P0320. Changed the plugs, wires, distributor cap, rotor, cam/crank position fault sensor. Cleared the codes and drove the van. Now, the service engine soon light came on, with code P1345 showing. Changed the cam/crank sensor again, now it runs rough, sometimes doesn't stay running when first starting, and has no power. What else could it be or what is the next step?