I have just over 100km on my new 2011 Jeep Grand Cherokee Overland with the Hemi. When I am at a complete stop and accelerate in a straight line it sounds like the engine is coughing. I would not describe this noise as a shudder because you don't feel it, you can just hear it from within the truck. If you try to listen from outside then there is no noise. Has anybody else experienced this?