I have tried baber twice for one issue, my santro club was missing on patrol but fine on CNG. i shown that to baber but instead of fixing core issue he said i will tune engine, & recomended to use orignal parts of santro it will work. so he replaced two things plug & engine pipes and said it will work, then again he said if that issue is raised again i will replace another sensor for RPM as current one was chinese & not genuine so compatibility is not there, 2nd time he increased RPM speed & said it will work now, again issue was not fixed, today i tried Zaheer by getting his number from this forum, he was spot on before starting work he told me that there can be 3 issue, wiring with sensor(forget his name), injector set, 3 rd computer. he checked those three thing by replacing them with another santro. issue was with computer so thing thing is fixed now. so based on my experience i will recomend zaheer. i have not tried kishwar but he have good reputation as well. Zaheer shop is named 'Ideal motor' (3rd shop) in front of barkat rice mills next to Wheel & wheels auto market I -10