09 prostar with ISX randomly shutting down

[09pornstar]

Last update guys; after i swapped the ecm, changed the coolant level&temp, differential presure, oil temp&pressure sensors, fuel cut off selenoid, inspected the ecm harness&ignition wiring, changed all fuses, i finally decided to unplug the ecm power while engine was on to see what happens and i imediately slapped my forehead..the exact same faults came on..so i bypassed all that crap and conected the ecm to the batteries and truck never shutt off since..of course i need to get a new harness or find the culprit on a warm day..i spent under 450$ so i guess im happy i didnt drop it at the dealer! With your help i eliminated probable causes one by one and its finally working so thanks a lot guys!