Isuzu Windstar

Hello friends, I have an Isuzu Windstar of 99 CRDI 3.0 with the helm changed from the right to the left side. It has begun to fail, the revolutions are unstable and suddenly you run out of accelerator, and it begins to throw black smoke through the escape. I have taken it to the technician and after scanning it they found a code in the memory of the ECU (P0475) and they could not repair me. Let's see if someone can guide me what the problem can be or who can repair me. Thank you.

www.permoveo.ltd.uk/tabid/122/obd-eror-..s/isuzu/default.aspx ... friend enter that link and translate it into Spanish, there they explain well the error P0475