hope it works out for you,
as said previously you may be lucky and it could just be boost leak or vac leak,but if the car is higher mileage I would not be surprised if MAF,MAP, and VNT solenoid are on the way out, you could have to replace turbo hoses,anywhere between 65 and 75k is a bad mileage to buy these at as its time for so many things to be replaced, cambelt,clutch, sensors and switches mentioned above, various hoses, handbrake cables, radiator is common at around 7-9 years and that kind of mileage, upper and lower wishbones,arb drop links, clutch, flywheel and they do have swirl flaps and of course the egr but thankfully no DPF.
oil cooler is another well known weak area so a thorough inspection of the cooler pipes and unions is vital.
I speak from experience on this as although mine is currently non 111k all of the above have been replaced in the last 18 months along with two door handles ,a window control unit and I have had swirl flap delete and of course hybrid turbo and full suspension replacement as well...and I bought her at 76k, if I was to buy another derv GT I would buy a higher mileage one (100k or above ) and know its all likely been done.
these engines are good for 300k so no need to worry about the lump, better to evaluate on bodywork and work outside of basic servicing that has been carried out.
good luck! awesome car when running right and the atlantico is a peach of a colour..