Hi Scotty,

I have a 2019 Hyundai Sonata with only 3,200 miles, 2.4L N/A GDI 4 Cylinder engine with a 6 speed automatic transmission.  Whenever I come to a stop at a red light the idle speed will drop from 750 RPM to around 600 RPM several seconds after stopping.  This will be accompanied with a mild vibration coming from the brake pedal.  Sometimes it will cause my foot to vibrate, but recently it was so bad that my entire leg was vibrating.  If I release my foot from the brake pedal, I will not be able to replicate this until I get the car back up to speed and return to a complete stop again.  I find this to be strange, always use Top Tier gasoline, and everything else is fine with the car.  Help!

Jeff from Detroit