Welcome! Have you had all the recalls done? Tough to say why it would spool up more unless you are just noticing it. Turbo is powered off exhaust so it should only be spooling when you are on the pedal. In tow/haul mine will kinda stay active, acting like a mini engine brake.
One is a mass airflow and other is exhaust. If I had to take a guess at it your intake failed. If you go under the hood and pull the plastic cover off you should be able to view the intake. Most likely it’s melted
Welcome! Honestly, if you bought it and received that message, you need to return to purchaser and have them evaluate the truck over. If you’ve had the truck for a few days, you need to hop it on the highway for a while. These trucks don’t do well with stop and go driving. They need a minimum of...
https://www.ecodieselram.com/forum/threads/banks-intake-manifold-install.1574/page-2#post-18171 post #32 and on may help. I’ll do some more digging on the forum in a little while for torque sequence for intake manifold
I get the same issue. I think it’s the boot off the turbo turning down into the pipe. Or the gasket is bad. I resisted my gasket, I think I should have gotten a new one. Also I didn’t know the correct torque spec for the v band clamp so that could be a culprit too