I have a 2000 honda civic ex that is idling up and down. Have replaced the IAC sensor and it is still doing the same thing. Bled the coolant and still nothing. It fluxuates between 1000 and 2000 rpm. What else can I do?

 

If you didn't figure it out yet, try the engine coolant temp sensor. Cheap part and was causing mine to idle high when warm and caused it to not start until it cooled back down.