You will know if the throttle body needs to be cleaned if your gas pedal feels like it sticks sometimes. This is caused by a build up of gunk in your throttle body causing the throttle plate to stick. Maintenance is very easy just remove your air intake hose off the throttle body and then you can have somebody push down on your gas pedal or you can open up the throttle plate by pushing on the throttle cable linkage. After you have the throttle plate open spray throttle body cleaner inside it and on the throttle plate. Wipe it out with a rag. Put back on the air intake hose and you should be good. Make sure the car isn't running when you do this. The cost should only be about three dollers for a can of cleaner.