My car loses power when turning left in corners?

My car had recently transmission swap and the old transmission had jerking and gear slipping in 60km/h speed, but the new transmission is all good, but the only problem is loss of power as if my car is applying brakes and stalling when I am turning left in corners. The issue was first noticed in the old transmission also and now the new transmission does the same. I have checked for traction control but TCS light does not illuminate on dashboard and there is no error code on dashboard expect idle stop light flashing that shows that idle stop system is not working. From past 2 days I am noticing the issue too much. One time I even checked by turning TCS system off but still it behaves the same. When I turn left at whatever speed my car loses power and behaves like it is applying brakes by itself and stalling but after 1 or 2 seconds the car comes back to normal.