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From what I have investigated regarding the ICM, I have not found a 100% positive test to prove the ICM is bad, other than to swap out the unit for a known working one.

Ive Experienced the ICM...

swap the ECM or flash the ECM from the park avenue with the file from the Fbody.

Still failure?

Swap the ICM with a junk yard ICM, Replace with new ICM if found faulty. Use AcDelco's ICM....

The ICM often takes a dump at the most in opportune times;

Have you swapped the Ignition Control Module? If not, a local junkyard should have one for fairly cheap, My vehicle had refused to start...

- 3800 v6 series 3 Block, Series 2 upper intake manifold - throttle by Cable design
- A/C Delete
- Manual Transmission - T5
- 'Stock 'Rear end - Limited Slip.
- 1999 Fuel tank and pump Swap
-...