2001 Chevy blazer crank no start

[chevykid65]

2001 Chevy blazer, bought it not running, they put in a new fuel pump and gave up, I started by changing the spider and fuel pressure regulator. Next changed ignition module, then the ecm, after this it threw codes for crank position sensor and mass airflow after clearing the codes only the crank position code came back, changed crank position sensor and had a buddy with a stage 3 programmer come by to reset the system. It wouldn't calibrate the new sensor. Im thinking short in the wiring, could the bcm be part of the problem?
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