Hello all- I recently purchased a brand new 2010 GC Laredo V6. i notice when i start it in the morning, there is a slight tapping noise. It sounds like there is an exhaust leak by the manifold area. Its hard to believe there would be a leak because its brand new. When I drive it I hear that sound that there is a leak as it has that fluttering noise.

However, after the engine warms up, the sound is gone. no tapping noise, but the v6 almost sounds like a diesel (weird) Is this normal for a new GC? Anyone experience anything like this?