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Welcome to DieselPlace

Have you checked for any codes?
It sounds like you are going into limp mode due to an overboost condition..
The stock PCM settings for boost is a maximum of 12psi. Anything above 12 then the PCM will put the engine into limp mode and defuel to protect the engine.

Try dialing down your boost to a max of 10psi and see if things improve
 
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