As I mentioned earlier i was facing two issues
1) jerking 2) fuel smell in cabin while AC on
jerking was due to bad spark plug wire insulation which was leaking current. sorted out, and no more jerking now for last 600km.
For 2nd issue, I just switched vacuum pipes positions as explained on threads on pw before, now for last 600km drive with full AC on Alhumdulilah there is no fuel smell in cabin.