Editing Pontiac wont idle right

i have a 1996 pontiac sunfire 2.2 lit,well it runs good when you drive it,but when you come to a stop to idle,it starts running ruff.i have changed plugs and put some fuel injection cleaner in .but still idles ruff.the engine light is not on.does anybody have any idea what it could be?

| Editing help (opens in new window)