Isx15 randomly shutting down

[Kw9006nz]

Who did the demandate? If not 1 of the guys here guarantee its blocking codes from showing up, and you need to pull a copy of the program and send to rawze for review

Yes do the leak down test to a t as shown by rawze

When was the last time the high pressure fuel pump was rebuilt/replaced, those are notorious ceramic flaking engine killers around the 400k mi mark