I m experiencing following symptoms engine stall (P1603) on lower RPM with AC ON. I have checked there is no issue in AC as AC cooling is good and this issue appear when i accelerate speed from 0 Km to 20 Km or de-accelerate 20 KM to 0 KM when pressing brakes. It is very hard to troubleshoot and very randomly appearing. I have done all change spark plug, clean throttle body, Clean Sensor beneath throttle body (i think MAF Sensor). P1603 Error code come with P1605. See snapshot. I have freeze frame data of P1603 i will share it shortly.