2002 road king classic keeps stalling when i come to a stop and there is some backfire as well . when i first start up the bike it will idle .

If your bike is fuel injected, there is nothing you can do. You must take it to a shop and let them set the idle speed. If it's equipped with a carb, remove the air cleaner cover and look at the square top on the carb. Just to the right of that cover is a screw, the throttle stop screw. Turn this screw clockwise to increase the idle speed. It should idle at about 1000 RPM.

Good Luck
Steve