following issue arose all of a sudden while driving on petrol:
check light comes up all the time
rpm is very very unstable/rough - car gives zabardast jerks/ jhatka while driving
black smoke coming out and on revving the smoke increases
i did following myself:
cleaned TB and IAC and all is good
tried cleaning sensors TP/air flow/cam
negative battery terminal reset 'theory' also applied
but issue remains same as mentioned above.need suggestions/guidelines. 2004 jxr ff cng model 155k done.