I bought this car initially for a cross country road trip that never happened. It's a great car, it has its issues but what doesn't. However, this issue I have not been able to fix or even figure out. While idling, there sometimes is a tapping noise that sounds like an air valve is flapping about. This will happen for about 30 seconds, get faster, then go away all together. I haven't noticed any performance issues so I am not sure what it is. It is rather irritating, but I have not been able to figure it out.