Kia Forte 2020 rough idle on startup, vacuum lines to be inspected on Kia Forte

Some Kia Forte 2020 owners report experiencing rough idle on startup, often linked to vacuum leaks that can lead to poor engine performance and stalling. These vacuum leaks may cause symptoms such as increased emissions, reduced fuel economy, and difficulties starting the vehicle. To diagnose the issue, owners are advised to inspect vacuum hoses connected to components like the PCV valve, throttle body, brake booster, and air intake tube. Additionally, maintaining cleanliness of the throttle body and Mass Air Flow (MAF) sensor, checking the condition of spark plugs, and testing fuel pressure are essential steps. Addressing any identified vacuum leaks can significantly improve idle quality and prevent further complications related to rough idling.