many factors will effect your idling problem :-
1) plug is clog (u need to change plugs)
2) wrong plugs (oem plugs are better for proton engines)
3) your idling needle need to turn to more higher rpm reading.
4) morning weather and hot afternoons will effect your engines combustions, thats why u get rough/dead idling.
5) your carb need to be sprayed with carb cleaner once a while.
6) your distributor cap (need to take out and cut those unwanted carbons at the contact points)
7) check your plug cable.
anything more sifoo's ? :p