1997 nissan truck distributor trouble

I have a problem with the distributor or ecm on my truck, we have checked out and replaced many things alread, it stalls out when warmm it has 60,00km on it, the mechanic is at a loss, and keeps trying and switching things off it...he is not looking at an ecm...anyone have trouble like this...help Electronic components do tend to shut down when over heated. TV repair shops use canned air(used to blow off keyboards and other components) to cool electronics to see which ones are faulty.
Try cooling the ecm and coils after they get to the point of shutting down. In the USAF we used c.o. fire extinguishers for this.
Whatever cools it with the exception of wetting them down. Good luck.