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With engine idling check for vacuum at the turbo wastegate actuator. If none, check for vacuum at the orange hose at the wastegate solenoid. If ok there, grab the solenoid- it should be cycling and you should feel it vibrating. If not, try wiggling the solenoid harness and see if you can get intermittent vacuum. If you can, replace the pins in the harness connector (available from GM) If still no vacuum, replace the solenoid.
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