LOL...wow, before I installed the adapter, I checked and rechecked that each of the wires was attached to the correct pin in the schematics I had. That is not to say, the schematics were 100% correct. I also did continuity checks with a VOM.

Regarding the Ignition Contol Module, I had considered it as a possible source of problem but had not done a swap out because the rough idle problems disappeared and the engine ran fine at higher RPMs. Would this be the situation, and make sense, if the ICM was bad or going bad?