Cars Q&A

I own a Tata Indigo CS LS TDI 2010 October. The car is giving poor performance as well as millage. Also it emits white smoke in the morning during the first start and dark black smoke while accelerating. I have done the diesel pump nozzle calibration 2-3 months back. Can i get an expert advise on where to take my Indigo CS for a better treatment. Thank You, Amol.