I have mehran VX 2003. recently i overhauled engine, after overhauling i drove 1500 km. It is giving me 140km on long routes with full cylinder and 110 km on local rout. It has perfect starting and good pick. BUT
i am facing a problem at high speed above 100 km/h speed it suddenely starts taking jerks, when i release paddle , it becomes normal.
what is the cause of these jerks and solution plz