I have a 2002 chevy venture extended van. 3.4 engine auto transmission. Cranks will not start. Replaced fuel pump and have 35-50 psi at fuel rail. Replaced crank sensor under harmonic balancer, replace oil pressure switch, replace cam sensor in block at rear of engine, replaced module under coil packs, replaced pcm. Confirmed spark from ign. Coils. Have 1.9 -2.1 ohms resistance on all injectors. Have checked for obvious breaks in wiring (none found) any suggestions as to what my mechanic and I are missing? Van is located in Elkhart, Indiana.

That's a lot of parts! All tested bad?
Do you have injector pulse? You will need a noid light to test...

I do not know I will ask the mechanic today when I see him. I will post once I know.