Have you checked out anything that has been suggested?
Or are you waiting for a 'do this and it's fixed'
I ask because I see you keep asking questions.
Do the 'surging idle checklist '
Any cars I have had do this were due to large vacuum leaks, like forgetting to reinstall a vacuum line or the gasket under the carb was leaking. ( yes this is a FI car)
I have looked over everything and tried everything except to pull my distributer and re time it from scratch. I just seen the other guy had the same issues and hoped he had a answer that I dont
update !!! MY balancer spun and when I had the intake put on the gasket slipped down. Now, haven't got her back together yet but pretty confident we found the issue