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Your turbo has an electronic actuator on it that is controlled by the computer. It controls the vanes in the turbo to provide the needed boost at the demands of the engine. It sounds like that actuator is malfunctioning. Are you getting any codes or check engine lights? If so, then I would have the codes read to determine is the issue is the harness or the actuator itself. If there are no codes, then the actuator itself is bad.
You can replace just teh actuator without the need to replace the turbo. Be warned that is the vane stroke on the turbo is not moving properly, it is the reason the actuator gear motor is sticking and the whole turbo will need to be replaced. I just want you to be prepared on that in case the shop checks it and they state the turbo has a bad control rod.
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