Thought I would post an update since replacing my ECU and bring this thread to an end point - problem is FIXED! Pretty simple process to remove and replace the ECU - just a couple of bolts and 3 connectors. I ordered a new set of key blanks with the ECU and had them cut at a local locksmith. There is a simple process to associate these keys with the ignition and ECU in the car which worked without issue. I drove the car ~25 miles with the factory tune and without surprise, got a lean condition code since I am running an aftermarket CAI. So I loaded the BAMA 89 octane tune and have driven the car another ~50 miles on two different occasions and the problem seems to be resolved.