Please help me! My 1991 honda has an erratic idle. Fluxuating up to 2-2.5 rpm.it used to subsides when engine gets warm but now it constantly doing it. Symptoms are: bad gas mileage,failed air-care emissions,no air conditioning,leaking coolant. I've cleaned and replaced eacv,cleaned air filter,and changed spark plugs.

Possibilities:

. Air in cooling system. Fill radiator until coolant comes out of the bleeder screw.

. Ignition Control Module (ICM) is bad:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-4.html#post265896

:) I just want to say thank you to tx grease monkey. He is very helpful and a book of knowledge. He has made me look like a genious to my guy friends, because they all could not fix my idle issue with my car.
My year long headache is finally over.
Thanks

platinumdub, what was the final solution to your idle problem?