2001 Chevy Cavalier

hello. i have a 2001 chevy cavalier. my engine feels as if it wants to stall and cut out but it does not cut out. it feels like the engine sort of "jerks" when i'm idling or in park but when i drive its fine i dont feel a thing. i had my spark plug wires and plugs changed, as well as my fuel filter replaced but the problem still occurrs. i asked a mechanic if it might be the air control valve or another sensor in my car. i have little knowledge of mechanics so a relpy to this problem will be very helpful. thanks