Hi all, My C8 has developed a new problem. For a couple of weeks it has been playing up- losing power at low revs/idling, hopping, intermittent black smoke. But running just fine at speed in the higher gears. Today whilst driving there was a loud pop, and the car immediately became gutless (especially on hills), belching black smoke, and the turbo is whistling like hell when the accelerator is pushed. Any suggested prognosis?? Cheers Dave Ps. Historically the engine has been replaced due to cam belt snapping, and the DPF has been removed although the ecu mapping may have been borked cos I still get the 'Diesel Additive' warning message.