STARLETS HAVE A TENDENCY TO IDLE A LOWER IN HOTTER CLIMATES, I DONT KNOW WHY ITS ODD, I THINK ITS because NORMALLY IN JAPAN THE AC WOULD BE ON, AND THE ECU WOULD BE UPPING THE IDLE FOR THAT SO WOULDNT NOTICE. IMO THE IDLE SHOULD BE SET TO ABOUT 1K RPM, I FOUND THIS IS WHERE THE ENGINE ALWAYS IDLED SMOOTHEST, AND STOPS IT FROM POTENTIALLY STALLING, IN THE SUMMER WITH THE IDLE SET AT 1K, IT WILL DROP TO BETWEEN 7-800 RPM, THIS IS FINE, AGAIN THIS IS ALL FROM EXPERIENCE, I DONT THINK ITS ANYTHING TO WORRY ABOUT, OR START REPLACING ALL SORTS OF SENSORS OVER.