Low RMP (safe mode?), P2110 code, vibrating throttle plate. Replace TB?

I got ODB2 code reader, multi-meter, and a basic set of wrenches. :) With the OBD2 reader, I think I can read throttle position. Hm, should have done it. As far as what I observed, am I correct in assuming that plate should not vibrate or close/open without gas being moved?

The conditions you were watching it under , may not have been ideal. While not running it is 'searching' for the ideal position-which it cant find-because it is not running- IF you are not able to monitor live data (dont think a code reader will) , then your least expensive bet may be to have a shop you trust scan it (monitor while running) and determine the best route for repair. Them doing it might be less expensive in the long run , than buying all the necessary tools and equipment (plus parts) to do the job correctly. Good luck.

I see. Makes sense. I have a friend with a "professional" scanner that can monitor whole bunch of parameters and plot fancy live graphs. Could you tell me what parameters/sensors should I monitor?