Actually on my side.......... since ghandhara was not helping.. I did something myself with the help of the dealership. One of the senior staff there was very helpful...he arranged and replaced some parts for me with payment... including the fuel tank pressure sensor, MAP sensor, and even the fuel pump. But the problem is still not fixed.
I also checked the manifold and other sensors by watching videos online and they all seem to be working fine.
The dealership has also called and emailed ghandhara many times over the last 6 months, asking them to send a technical person or someone from the Chinese team, but they never replied.
Now I am thinking to visit a technical expert available in Lahore who deals with Mercedes and other Japanese or European cars