Ok I知 stumped here and need som help.




I went out and started my truck the other day to warm up I went back inside and while inside it shut off. The dash was all lit up but motor was off.




Since then whenever the motor is not fully warmed up the motor will shut off it has done it warming up and also while driving before the motor gets to temp. Only felt it bogging down once but usually just clean on to off but dash and everything stays on just motor shuts off.




My first thought is wire harness chafing because I shook the wire harness and it starts up most of the time that I do that. Until yesterday when I had my SCT tuner monitoring and my Ficm power went from 45 while running and dropped all the way to 20 but was still running normally for 15 min or so then died. I shook wires with no luck for a bit then decided to retune to see if that did anything (I have retuned 3 or 4 times since the issue started with no change even tuned back to stock)




Once it was done tuning I jiggled the wire harness one more time and went to start it and it started right up FICM power was at 48.5 and held strong above 48v for 20 min. I decided to tempt fate and drive to my buddies to look it over. It drove like normal no lagging no rough running and stayed above 48v the whole way so I am very confused.




Any thoughts?