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Sounds as if there is one or more cylinders misfiring. Possible defective ignition coil/spark plug/s/ or ignition wires. IS the vehicle blowing black smoke out the tail pipe? If so, another possibility could be an over fuel situation caused by a defective sensor or leaking fuel pressure regulator. My guess would be a mis fire causing the engine to not fire on all cylinders
have a turbo boost pressure test done under load on a chassis dyno
under load the boost should be right up
check for leaks in the intercooler hose fittings or cracks in the intercooler
black smoke under load indicates a faulty turbo or turbo air leaks.
white smoke is normaly an indication of water entering the combustion chamber of your engine due to a broken head gasket. I am surprised that it stoped but I think that the probelm will come back.
What colour smoke is it..... if its Black then the pump is over fueling so both pump and injecters need doing.
But if the smoke is BLUE then you have engine problem like Rings or Valve guides etc
so lets hope you have BLACK
Have a good day
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