I have a 2005 Grand with the 4.7L engine. The clicks fairly loud at first but quiets up after about 30 seconds. Yesterday morning as I was driving to work the first mile the car would jerk at 35 mph a little like it wasn't getting enough fuel, but after about 30 seconds this to went away. Later that evening I drove up to the mountains where the Jeep sat for about 2 hours. On the way down I heard what sounded like an exhaust leak with a very pronounced clicking noise. This too went away after about 5 minutes. Last week I changed the spark plugs to Bosch Platinum IR Fushion plugs. Could there be a link? I am running Mobil 1 full synthetic. Thanks!