Hi, recently my car (every now and then, more frequent recently) has started to "gurgle" at idle. It'll be idling fine and then all of a sudden it will just start to do it. Yesterday, my CEL came on for a minute than turned off (it did this twice, during the day). Any ideas on why this would be happening. It's got new Plugs, Wires, Cap and Rotor, Fuel Filter, Air Filter, Timing Belt, Water Pump.