This is a new one. Over the weekend I was working on my exhaust so I had the car up on jack stands. Last night I had it all wrapped up so I started the car to let it run and check for leaks. Pulled the shifter into neutral, clutch in, started the car, clutch out. Got out of the car and I notice the back wheels are turning, slowly. I could stop them with my foot but once I let my foot off they would slowwwwwly start spinning again. After it ran for a few minutes I stopped them with my foot again and they didn't spin anymore. How is it even possible for them to turn when the transmission is completely out of gear? What would cause this?