So I have a 2020 Silverado 1500 crew cab 2wd Custom with 371 miles on it. When the vehicle is in park it has a rough idle/vibration in the driver seat/front cab. The rpms are not moving at all but I can very strongly feel it idling. When I make the rpms go above 500 it goes away. This only happens when not moving in any gear. When driving, the truck is as smooth as can be.