Cummins ISM not reading boost correctly?

[Mikesuburban1]

I did a combustion leak test today and everything seemed good. Im still waiting on my buddy to come with his insite so we can read the sensors. I also noticed im using more fuel and the last time it was like that the egr valve was stuck open but i took one end on the cooler off and it opens and close so i dont think its that. Im just baffled the truck ran so good it was pulling like a freight train and out of knowheres it gives me problems again