Ed,
Based on your internet search of this problem, it appears that there  isn't 
one single source of the problem. Good luck. I had an ignition problem on  an 
old 84 Pontiac Fiero one time. It turned out that a corroded screw inside the  
distributor was causing the problem. Took me almost four months and a lot of  
work to find this nasty corroded screw which also served as a device ground. A 
 few swipes with a brass brus and some emory cloth solved the problem. Soon 
after  I gave the car away. :)
 
Rummy