Check IAC motor sit on the throttle body it controls the idle speed of the engine if bad or dirty will not be able to control idle speed, try cleaning it with carb spray first if that don't work ,it will have to be replace, also check for vacum leaks, but more then likely Idle Air Control is bad.
There are usually return springs but it could just be that your car coast a long time when in high gear before it starts to slow down. My Jeep is the same way, if I'm running at 55 I can coast for a few miles before I slow down very much.
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