Some while back I was doing a favor for a lady whose engine would always die when the car came to a stop. Sure enough, everytime you came to a complete stop the engine would shut down. Spent hours lookint at fuel solenoids, oil pressure cut-out switches etc.
FINALLY, I realized that her carburator was not bolted down properly, and, with a large forward weighted air cleaner, everytime you slowed down to a stop the assembly would tip forward, suck in air at the base, and die. Needless to say that after the stop the carburator would resettle on its base and everything would be O.K.
Turns out her teenage kid was playing with the carb and forgot to fully bolt it back down.
LESSON LEARNED, look for the obvious first. I'm embarassed that it took me so long to find the problem
Ivan Vegvary