VCheng, ngen and Konichiwa, thank you very much for your efforts and help.
I am feeling helpless. Everybody just charging a good amount as diagnostic charges and saying different part or sensor name. I heard that in Karachi there is so many good workshop and mechanics but when I went there I come to know that everybody just want to rip you off as there is no tomorrow. They just try their best to take every single penny out from your pocket as long as you can afford.
When thay feel you reach your limit and your budget to spend is end, they start saying "Get rid off this car, typical engine, who suggest you to buy Mitsubishi (or whatever the make and model is.), this is not a good car, sale it off and buy any Suzuki model" bla bla. But actually the thing is they knew that now you don't have money and the last option they can make money from you to make you agree to sale your car and buy you any other model to make commission.
That is the story which is happened to most of my friend and family members who living here. Let see what is going to be happened with me.