My 300c has the great Hemi Engine. Love the car but every so often I will be driving at normal speed and the engine will go into a very noticeable power reduction. As if you were to pull your foot back from the accelerator. No stall, no jerk, just a power reduction. Each time this happens the interruption will last about five seconds and then we are back to normal operation. No lights, bells, or any other indication that there has been a problem. I have not had the car in to see if there are any codes associated with this yet.