I have this wierd rattle under my valve cover. It's barely audible from inside the car, and its very sporatic. At times like a rapidfire tapping, and other times it hapens once or twice a second. Very arhythmic though, and doesn't sound like preignition (says my stepdad). Someone said it might be a valve, but...BTW I drive an 03 ATX duratec 2.3. any ideas?
