Engine Surge with A/C running

[puding]

Hello,

My 2004 4.4i had recently developed the engine surge with the AC running and the surge is pretty obvious while stopped at a traffic light or in a very slow traffic. If I turn the AC off, the surging is gone.

Just called my SA at chapman BMW and he said it could be because of the bad fuel. I always use Shell premium (91).

FYI, I had the transmission software update done some time in last year.

Has any one else has seen this behaviour?

Thanks