Irregular idle with no code

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like your Jeep Liberty’s irregular idle might be due to issues like a dirty idle air control valve (IAC), a vacuum leak, or a problem with the throttle body. Since it idles high when cold and sometimes stalls, the IAC could be sticking or dirty, affecting air flow at idle. It’s worth cleaning the IAC and checking for any vacuum leaks near the intake manifold—simple fixes that could bring some smoothness back. If you need further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.