1996 GMC Truck

Electrical problem
1996 GMC Truck 6 cyl Four Wheel Drive Automatic

the vehicle had codes for multiple missfire mass airflow sensor, and couple other codes. When starting vehicle put it into gear it would die start it again it would take of sometimes or die, once it was going down the road it was fine than all of a suden it lost power than died now it wont start, replaced cranksensor, camsensor, distributor, coil, ignition module, egr valve, but it has no spark at all please help. Thanks glenn