Hyundai Genesis Coupe sport mode idle issue with high RPMs after downshift on Hyundai Genesis Coupe

Some Hyundai Genesis Coupe owners report experiencing high RPM idle issues, with symptoms including the car bouncing between 1500-2500 RPMs, rough idle, and difficulty starting. These fluctuations can be influenced by engine load from AC or electronics, which some consider normal behavior. Additionally, some drivers have noted rough idle during cold starts and poor off-idle response, with temporary relief achieved by revving the engine past 2000 RPM. In certain cases, the engine may accelerate unexpectedly when the foot is off the gas pedal, causing idle speeds to reach 3000 RPM instead of the typical 900-1000 RPM range. Reports also indicate that the car may idle too high, even when warm, with occasional revs up to 1500 RPM and subsequent drops. Changes in idle behavior over time have been observed, such as idling at 1250 RPM briefly before settling back to 700 RPM. Monitoring intake temperature and RPM behavior during cold starts can provide valuable insights, especially ensuring that RPMs do not exceed 1500 on very cold starts. To address these issues, owners are advised to check for mechanical problems or sensor malfunctions, inspect the idle air control valve for blockages, and maintain regular servicing of the vehicle.