So, if I return my main relay to stock and still get the same steady on CEL with the service connector that would at least suggest (sound like) a bad ecu?

I'll give that a try along with the distributor and ignition coil checks.

Thanks for all of your help - any other comments/suggestions welcome as well.

 

Yes

If the distributor connector gets power and the coil is good, then next consider the igniter unit in the distributor. The service manual recommends a series of useful input tests that should be done, whereas an Auto Parts store may be able to directly test the igniter unit.

 

Steady on CEL with the test jumper installed is normal. The system is OK. It means there are no codes stored. Most of these crank but no start situations do not set a code.

Steady on CEL with the test jumper not installed is a problem.