i was facing a similar prob last week,with my carby cultus,extreme jurks specially n light gears,wasted few bucks on cng tunings plug cleaning stuff,,unsuccessfully,,,,,,,,,finally did self diagnosis,despite of being a layman,after engine start one by one took off the plug cables ,and culprit was one of the wires,had no spark,went to an electrician,borrowed a spare cable from him of mehran,and problem sorted,it was a hell of a relief,as i have been dragging her to work for almost three days,,,got chinese brand of plug wires for 750rs,NGK as per autos was for 1200,but to me it never sounded as genuine,with poor finishing,went for chinese,,,,,uptill now they are fannnnnnnnnnne