This article is from the Chrysler-Plymouth-Dodge FAQ, by Dr. David Zatz with numerous contributions by others.
See the above section on vacuum hoses. Turning the cold or warm idle
screw on the carburetor is a quick fix that doesn't solve the real
problem. If the car stalls when cold, lubricate the choke well. If it
stalls when wet, try getting much better ignition wires (lifetime
warranty, good brand, about $30). Also try:
* Put window insulating tape (foam) over the top of the electronic
* Spray the little wires with silicone spray or wire drier
* Check for vacuum leaks (see above).