I own an ASX 2014 model manual with 4b11 mivec 2.0l petrol engine. The car has a problem with the rpms especially when you rev it a bit in neutral. Immediately after revving the engine when you leave the throttle the rpms drop down below 500rpms and the engine quiets as if it has stalled then immediately corrects itself to about 700rpm. sometimes it does it even when you are at the stop light the rpms drop beyond 500rpm and then suddenly corrects. It doesnt stall but you feel it that it has almost died. Changed the plugs,cleaned the throttle body (which was clean), . There are no codes at all. the car drives well , no loss of power .