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Boost pressure



I have a 2020 Mack Pinnacle. Truck has been deleted and runs good at times with boost pressure of 40+ pounds, then all of a sudden the boost pressure will drop to 20 pounds and won't build above that. Driver can pull over cut the truck off and restart the engine and it may run fine for 5 miles or 100 miles. I know of some other guys having the same issues of low boost pressure. Anyone have any ideas of what the problem could be?

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