Throttle body. It's where the air intake connects to the engine, don't have a picture for this, but honestly if you can't find it, don't try it. If it's an electronic throttle body, which it most likely is, and you mess it up, it's a very expensive repair. Not trying to be rude, just honest. If you still insist on doing it, there should be a piece of piping, coming from the air intake/filter box, connecting that to the top of the engine. Where that piping connects to, that's the throttle body. If you look into it, it should be a cylinder, with a metal flap in it. You want to spray around the metal flap, that will remove any dirt. Be extremely careful with this...
