Do you have the LS1/LS6 or LS2/LS3/LS7 harness and what crank sensor are you using? Reason I ask is the LS1/ harness supplies 12 volts to the crank sensor and the LS2/ harness supplies 5 volts. If you have mismatched the sensor with the wrong voltage harness you will likely have a problem.
Don
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