lolz.... well, finally found where got sell the spark plugs for my car... changed to new one, after start car, ok for a while... maybe 3 mins, then died again... i was like WTF.... stresss.......... had trouble starting the car.... after starting the car... i let it idle to see whether the same thing will happen or not... idle for 5mins, ok. then went to test, rev until 6k+ still ok... just now drove around, no trouble... hope the problem really solved....