Do you have the dangerous "throttle-by-wire" system that put Toyota in the news? That system replaces the common sense throttle cable with two throttle position sensors, a computer, a motor-drive throttle plate, and lots of electrical wire and connectors. Anytime you add an unreliable computer to a formerly trouble-free system, you add complexity and problems. Most of the throttle bodies are not serviceable because any hands that get into it will be a potential party to the future lawsuits. Those units are replaced, not fixed.
If you still have the trouble-free older throttle body, all that can go wrong with them is a small passage becomes blocked with carbon affecting the idle speed of the engine, or the throttle shaft's bushings wear and create a vacuum leak. Neither of those problems is dangerous, common, or expensive to repair. Makes you wonder why they stopped using them.