1997 Honda Accord stalling at an idle

My 1997 Honda Accord Lx stalls or idles really low when I am stopped in traffic. If the ac or heat is on it almost always stalls right away. It starts right back up and runs fine as long as im moving. I do have a slight radiator leak and im replaceing that, but it has never overheated or anything? Temperature stays normal. Over the last year and a half my car has on rare occasions idled spuratically but always cleared up and never caused any problems. We have checked for vaccum hose leaks and my air filter was a little dirty but nothing major.