guys i hav been facing a strange problem scince a year on petrol it runs fine but on CNG when i reach the speed of 100 km/h, or if i apply sudden break or try to run on high rpm in lower gears it start jerking like missing i hav doen engine tune up CNG kit and cylinder serviced new spark plug and point spark plug on the gauge of .10 mm instead of .08 but the problem still prevails kindly help me out of this situation coz its dangerous on a two way trafic when i hav to overtake other car at the speed of 100 km/h