I drive a 2009 vw with the 2.5 engine with 130k on the clock. So as I’m pulling back into work from lunch, my cel comes on. I pull into my spot and notice that rather than idling as normal, my rpm is rhythmically bouncing between 1100 and 1300. Shut off, restarted, normal for a few seconds and right back to bouncing around. I’m going to have it scanned asap, but any ideas of what might cause this? Should I drive it to a shop or leave it where it is?