Sounds like blocked dpf or wastegate solinoid pipes but looking at egr pipe etc
Force regen or dpf removal and remap chris pm me if want details
there is a common fault with this car/engine which is a split intake boost pipe/hose, if you open the bonnet and look down to the right ,just in front the battery you will see a large black boost pipe, feel the back of the pipe for any splits, you may find its covered in oil so be prepared to get dirty.