Just an update:
Pgackerman and I replaced my egr gasket work around with a proper egr gasket. Then we reset the ecm, adjusted the tb to 30 steps iac and .49 volt tps. We went for a victory lap and herd a crazy sound, just once, and just for a couple seconds. Sounded like someone was on the hood of the car on a sit-n-spin. We stopped, looked at each other horrified and jumped out to investigate. We found nothing. Checked the fan, wheels, looked for dead cats and kids dragging under the car and nothing. Totally weird.
We decided it best to change the oil and filter, so tomorrow I'll do that. We cleaned Windows and the interior plastics. I'll put conditioner on the vinyl tomorrow and degrease the motor after the oil change.
Could one of you coming to Augusta bring a timing gun? Mine's shot (harbor freight) and I'd feel much better checking it once more. There is a slight oscillation at idle and I'd feel better making sure timing is still set. I started to fiddle with it when my light went out.