I never would have guessed that a plug wire that was reading ohm correctly would cause this lol.Update - Just wanted to let everyone know what I finally found and fixed.
I found an intermittent spark plug wire, that was causing all of my rough idle issues. Even though I ohmed out each wire, and they were will within the tolerance described in my service manual, at least one was defective. I had previously replaced them in the past 5 years. After putting a new set it, the car runs perfect.
Kind of a bummer that it caused all of these issues! That cat isn't cheap