Ok, so ran a scan and it turns out to be a clogged exhaust particulate filter. Exhaust warranty work was done for a previous owner in 2018. I'll check with dealer for continued warranty coverage. Not sure if aftermarket exhaust will disqualify me for coverage. It is running normal again & warning lights gone...maybe the limited RMPs were to deliberately handicap me until I fixed the problem. So it's either covered by VW, or it appears I can clean and restore the existing filter. New filter is $1600 for aftermarket, so that is last resort.
I'm a VW newb & it took me a minute to remember all that talk a few years back about the emissions scandal. Never thought it would pertain to me so I didn't give it much thought at the time.
Thanks for the help all!