Have Honda Questions? Ask a Honda Repair Expert.
Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.
You could have a vacuum leaking causing the high idle. Check for codes first looking for a lean code. You can also find vacuum leaks by spraying carb cleaner while the engine is at idle, if the rpm drops you found a leak. Also another common problem for this is a dirty throttle body or a idle air control valve that is sticking because of carbon or a faulty IAC valve.
Please reply to this if you need more help and we can continue this conversation at no extra charge. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Hoping to be giving you 5 star service.