Hello, I have a silly questions on my 2008 Corolla LE with about 13,500 miles. When I started the engine in the morning, the RPM is around 2x1000. It decreases to lower RPM 2-3 minutes later. This is during the summer time with 70-80 degrees in the morning. I probably understand if its the winter time. Also, when I put a gear in "Drive" and ready to take off, sometime I heard a poping noise; I'm not sure where the poping noise comes from. Is this normal for a 9th/any gen corolla? I'm just curious. Any feedback will be appreciated.