Hi all i am driving a 2007 CS3 CVT with mileage 97k now. Recently my car vibrates or jerks and sometimes even stalls especially on a traffic jam. It happens when my air-con compressor kicks in and i can feel a instant jerks with RPM going down to 500. But normal driving with air-con off doesn't have any problems. My engine is stock with K&N drop-in filter, Super-sprint exhaust with regular servicing every 10k mileage. Send my ride to CH motors and change my engine mounting, clean throttle body, adjust my idling sensor but problem still occurs. Even changing ISC motor doesn't help. Joesph told me that for some CS3 rare cases might be the air-con ECU module faulty. Any bros here encounter this problem before? Due to my work nature have no chance to send my car whole day to check. But will be taking a day off and leave my car in CH motors for diagnose..