im from setapak...last time my ecu got problem oso fix by u 1...
OIC...
Idling problem quite often happening to SVT, but it can be resolve one don't worry.
Try look into the following (take one step first, if problem continue then move to next):
1) Vacuum leak - check all the vacuum hose and make sure no crack and in place tightly. Check your surge tank is sitting properlly.
2) *clean your idling speed cotrol valve. Chinozie website has a good DIY step by step instruction.
3) *clean your AFM's flap
4) *service your 4-throttle
5) admitted to 20V workshop - Cheras, Sg Besi, Puchong, Shah Alam, Old Klg Rd... you name it, we will give you the contact
*by using a good Carb Cleaner
IMHO, fuel supply interruption will cause jerking problem but not idling problem. Correct me if i am wrong ya.