We are having a similar problem. i think we have narrowed it down to a wiring issue somewhere on the wires from the boost pressure sensor.
2011 chu613 mp8
i am replacing the boost pressure sensor again just to verifiy its not the problem.
Friday i will be replacing the connector for the sensor, we will go from there.
Truck lost power,each time the boost pressure would drop to nothing, several trips to the dealer and other shops, each time it cam back it ran for a little bit then fell on its face every time.
This morning I wiggled the wires on the sensor it ran fine until i hit a bump the back down.
now I cant get it to run right again!
we will see what a new sensor and a connector does.
anybody know what the readings on the 4 wires on the boost sensor should be?