elis94camaro

So Ive been having this small problem that has been driving me crazy.My idle starts to get kind of shaky when it warms up and kind of sounds as if i have a cam in my car.When I start it up the idle is pretty smooth as it can be but once it warms up and drops rpm it changes.Its not causing the car to stall or anything like that, I just want my car to be smooth all the time.Its only at idle and its a 94 camaro lt1. So if any one knows anything helpful i would appreciate it.