Rpm doesn't go down when braking.
Yesterday while driving I noticed that when I pressed the brake the engine still sounded like I was pressing the gas pedal until I got to almost 0mph and then it would go down to normal. I'll admit it wasn't happening until after I goosed the throttle a couple times but I don't know if that would cause the problem. I asked my auto tech teacher and he said something ( I forget what he called it) next to the throttle needs to be clean probably. Anybody know what that is?