[MrWrongsalive]

Make sure the antifreeze is full, (this is done by loosening the 12mm bleeder screw on the upper radiator hose water neck), be careful I've seen them break off after so many years, then you fill the radiator until only antifreeze and not air bubbles comes out of the bleeder screw, afterwards just close the screw and top off the reservior. Hondas rely quite a bit on coolant temperature for maintianing idle and setting the proper fuel curves. The computer may very well think the engine is operating at 500 degrees and is trying to compensate by adjusting the idle.
This ofcourse would be my first step in diagnosing the idle problem, there may be other causes. As far as cutting out goes it depends on how the car cuts out, does it sputter out or is it like someone just hit a switch and it dies abruptly?
GOOD LUCK