No start

[Rmartin-97]

My buddy has a 6.4 with ********** tunes. Today he was driving down the road and it died and won't restart. But if he returns the truck to stock it will start then. What could cause this issue?

 

[Black AOD]

It's a 6.4 for starters LOL

 

[08Monster]

I had that issue with my dash daq. When it was plugged in the truck would die and not restart