What should I clean, inspect, replace, etc... I've only had this vehicle for a few months, so I have to assume that the throttle body has not ever been serviced. A little advice on how to remove/clean specific parts would help a lot since I'm new to fuel injection.

 

I would recommend removing the TPS and IAC and throughly cleaning both. I would also clean out the IAC air passage and the rest of the inside of the TB in general. Carbon buildup can cause the TPS and IAC sensors to go whack. Remember to set both TPS and IAC correctly when re-installing. IAC pintle should be no more than 28mm from tip to flange and TPS should be set to .54V at full closed (need to use a DVM to make sure).