Idle really rough -Video attached

[talam_buruk]

Dear all Microtech sifu,

I do have issues with my 3sgte , idle really rough . The video showed once I start the car engine. and idle

http://www.youtube.com/watch?v=bqi3l6bMn34
Spec
LT8s
3sgte
540cc
gt35r
internal all stock

does this related to any vacuum leak ?/ mechanical issues / setting in microtech or related to miss firing ? spark plug / cable plug ?

I do not have issues on high rpm / 1500 rpm and above.

Thanks for your advice.