First of all thanx all of you for qiuck reply. Im @ kalutara. As you told i cleaned the plugs, plug wires and carb too. Previous owner was not run the vehicle for long time. So i cleaned the petrol tank also. My mechanic say, it will be ok when i use it few days and asked to start and keep accelerate the vehihle for few minits before drive. That problem is somewaht ok. but not totally.
Thanx.