Upon switching on the car, after the engine gains idling speed, right side of the engine jerks periodically - maybe in one or two seconds timing. Same is continued while waiting at signals. Replaced all belts, and bearings. Replaced engine mounting. Problem still on.

This problem has been going on for a while. It does not affect the car's performance but it is a annoyance, especially when there are passengers and they ask what that is. The vehicle cost more than R300 000 and it idles worse than most cheap vehicles.