I would start by checking the free operation of the turbo actuator.
How do I do this ? :)
Thanks
Find the diaphragm that opereates the turbo vanes, which should be apparent near to the turbo, remove the small vacuum hose and replace with a pice of hose you can suck on. When you such you should see the actuiator move and then return to its resting position if everything is working okay.
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