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Well got it all figured out it was a turbo waste gate failure. Thanks for the help.

K&N but the problem was there before that was installed it has been an on going troubleshooting nightmare.

The boost pressure will hold up to 15 psi, but once 22 psi is achieved it bleeds off rapidly to zero. If any further info is needed I would be glad to add. Thanks.

Yeah all piping in tack and new cold air intake.

My friend has a 14 6.7. I am having issues with turbo boost pressure. When I step on it hard my turbo boost goes to 22psi and then drops to zero. When I get off the throttle and step on it again the boost goes back to 22psi and then drops right back down to zero. The truck has had the ***...