motor shutting off intermittently while driving isx15

[aarmon8908]

My mechanic has already checked the battery connections. I will get him to recheck the starter cables tomorrow. I did just recently buy an ecm, but I wanted to try EVERYTHING first before taking my truck 4 hours away to the tuner (Trucks deleted) This is the original ecm and I've driven the truck about 160k mi since the delete with no issues until recently