02 Astro RWD. Weak injector pulse. When you turn the motor by hand the injectors will fire. When you use the starter the noid light is really dim. Have replaced the PCM, ICM, Crank sensor, Cam sensor, ignition switch, ran jumper wires to eliminate harness issues checked all the harness grounds and grounded the engine to the chassis with another ground. Any help would be greatly appreciated.

 

Solved. Third time thru the data stream MAP showed unusual voltage in the MAP replaced started right up.