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Whats happening is that you are manually controlling the boost.. the ECU doesn't like this and tries to fight the boost controler to operate the wastegate. it can't, so the ecu cuts the fuel to prevent damage to the engine. Back off on the manual boost controller to a lower psi and it will clear up..
I myself just shortened the wastegate actuator rod and have had not trouble one with it.. it does the same thing as your manual boost controller, but allows the ecu to still operate the wastegate, therefore no shutting down..
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