idle rough

my geo idles rough upon starting and at stop signs then stalls sometimes i just had the heads done the idle timing checked for it to pass smog what other reason wouls i have. in plan english as am a female tring to save money

Well, i'd adjust the idle up a little bit. New spark plugs and wires, and a distributor cap and rotor($10 for cap and rotor). Basically, a small tune-up. I bet it'll be happy then :)