Where are you guys idling at stoplights after the car is warmed up without accessories and without ac? I just connected my obd reader and it's at 550rpm and sometimes 650 rpm. Right around that middle tack. I can feel a slight vibration when it idles at 550rpm. It seems stable, no flunctuation. But it does seem low, when I turn on lights and ac idles at stoplights around 650-750. Where are you guys idling at stoplights without accessories ?