Brother , I have 2014 Model Mehran and I am also facing same problem , when heat it start Jerking , Jhatkeee...
As i read the above it seems common problem of Mehran....
When i observe this problem i go to mechanic , he says you should clean up throatle boddy & change the plug.
After spending Rs 1600......problem same...Jetke peee jatkaa ..when heat up.
Again contact with mechanic , he say might be current problem ...Go to electrical he charge Rs 300 and check the current with computer
No electrical fault ...Now he say its problem of fuel pump.
Still never change that pump...
Suzuki Mehran Totallly Fail .........CAR.
Freinds need your comments and experience..
We should raise the voice against this issue...