Hello. I have a question about a noise coming from my 04 vw beetle. When I let it idle for a while I get a fast ticking noise from the engine. When I rev the engine up and give it some gas it stops, and I cannot hear the ticking any more.It resumes once the car idles a bit more. It does not start immediately when the car is idling, it just starts after about 2 minutes of idling. What could it be? I recently rented a 2016 Toyota 4Runner and it had the exact same "problem" what could it be? Please "enlighten" me!