After driving in gear, when i coast, my civic sometimes idles at 1100 rpms, to make it idle normally (700 rpms), I have to step on the gas in neutral to make the needle bounce back to idling at 700 rpms. But it would idle around 1100 rpms again if i was to put it back into gear and gas it. Its like the rpm is stuck unless i gas it up and let it settle back to normal idle.