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Boost leak, betcha
had the same problem on mine. It turned out to be a both rubber boots that go from the turbo to the intercooler and from the intercooler to the throttle were split. Under boost, air blows out the splits, leading to less air in the intake manifold that the MAF has led the DME to believe. So, the DME increases the duty cycle of the injectors to provide more fuel to maintain the right mix with all that air. Trouble is, the air isn't there, leading to an over-rich condition and black smoke (lots of it). Both boots are available online, pretty easy fix (you have to take the airbox off, then it becomes easy.
Good luck.
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