1996 chevrolet 6.5l turbo shuts off while driving - intermittently
 

For about a year now, I will be driving the truck and it will turn off and then back on by itself. It does it only occasionally. I have changed the lower fuel pump, fuel filter and checked all grounds. Garages have not been able to figure it out. Its now doing it more frequently. Sometimes when stopping at a light, it turns off. It starts right back up.

Any ideas or thoughts would be appreciated. The truck's computer is not throwing any error codes.