thanks everybody for giving opinion.
yesterday i exchange the TB with my fren, and solved 2 problem
1) idling become better. though sometime will raise and drop abit if compared wiht my fren which his car RPM needle stay still on that RPM :P
2) engine can start without step on the throttle pedal
what i did yesterday
1)exchange TB with fren. Firstly disconnect the additional FICD and monitor the idling. the idling was good. doesnt up and down like my previous TB
2)after that, i tried with connect the additional FICD with my fren TB. The car idling start to goes crazy, up and down. So i conclude that additional FICD is the culprit.
3)use back my TB without the FICD. adjust the RPM higher so that engine wont die when aircond kick in. found that my car still drop and raise at 500 rpm but it doesnt go up and down like crazy
4) use back my TB with FICD. found that sometime when air cond kick in the RPM doesnt drop much, sometime when aircond kick in, the rpm drop until engine mati :-s
My finding- when turn off the air cond, or when i turn the aircond to the coolest, i find the idling was very smooth, no drop or raise at all. when the air cond turn to the warment, when compressor start kick in the RPM drop obviously. could it be the power supply problem also?