Hi to all perdana fellower

I'm having some problem with my perdana sei throttle body...
Recently juz modified with addition FICD along tb...it solved the problem & went fine everything no more fluctuate rev...

After 2 month since FICD add on system, problem arise again...

1)whenever cold start, engine will not revup as normal even jerk & vibrate almost stalled
2)when drive gear engaged to D or R idling drop very low around 400-500rpm

So is it my FICD dead?