Edbowling

Help! I drive the truck about 5 miles and it just dies. I have replaced the fuel pump, had the keys reprogrammed, replaced the ECM. No codes coming up. Truck runs great while it runs. It has a ford alarm and after market Alpine alarm, could this be the problem? I've had the truck for about a year. Have had a couple incidents where it didn't want to start, but after about 20 minutes it would start up. All relays have been tested.