Hi, am in need help & advise. I am driving an Auto Kenari since year 2006 188k Mileage in total, no modification to it.
Since I got this car not long, its first ever Engine Stall was entering a car park when its still bout 4months old, sent to perodua sc to find out the problem. No problem to be found.

After some time it has random engine stall but not frequent. Most of the time is during traffic jam, when I was trying to shift lane from full stop. Once I turn the power steering it stalled. So I went and check power steering motor, no issue as well.

Up until since last year onwards, the throttle not stable during idle mode (Neutral gear as well as D4 gear with breaks on). The RPM kept from approx. 1100 drop to 600 then rise again and the engine kept choking but didn't lead to engine stall problem.

Mechanic has check spark plug, idle sensor, FCU board, spark coil, cleaned throttle body with chemical cleaner, no issue with all these parts. Still can't find the causes of this unstable throttle.

I am wondering has it anything to do with torque converter / throttle body worn out? Or unstable electricity?

Of cause I service my car always within 5k mileage.

Below are the video of the engine choking during D4 gear, this happen in Neutral Gear as well.

Of cause, once I accelerate and drive, the engine is as smooth as it was new... So am not sure is there anything wrong with transmission as it shift up and down without any issue. And my kenari can go up until 140km/h without any issue.

http://www.youtube.com/watch?v=FisFcfSqq0g&feature=youtu.be