Toyota Camry 2015: Engine making abnormal noise at 2000rpm

I have noticed some abnormal noises coming from the engine in the 2015 Toyota Camry I recently bought. First is when the car is started first thing in the morning when the engine would rev to 2000 rpm and be quite noisy at idle. However, after a minute or so it will go down to 1500 rpm at idle. The second noise is during acceleration is audible when the engine hits around 2000 rpm. The noise is only audible when in gear. I don't hear the noise when the car is in park and revved to 2000 rpm. Can you please tell me what might be the cause of these noises?