Why does my car sputter or cut off during parked idle?

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your vehicle. It sounds like your Cruze might have a few potential issues causing the sputtering at idle. Since you've recently replaced the timing belt and had the throttle body cleaned, it's possible that the issue could be related to a vacuum leak, a sensor malfunction, or even a problem with the fuel system. A vacuum leak can cause unsteady idle and sputtering, especially when the engine is idling at a lower RPM. Another possibility is a dirty or failing mass airflow sensor (MAF) or an idle air control valve (IAC). These components regulate the air entering the engine and can cause idle issues if they aren't functioning properly. Fuel delivery problems, such as a clogged fuel injector or a failing fuel pump, could also be at play. Since the problem persists after the repairs you've done, a thorough diagnostic scan to check for any stored trouble codes might help pinpoint the exact cause. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!