While driving I experienced a total lack of acceleration. the pedal felt as normal except that there was no power at all on pressing the accelerator pedal. I coasted to a halt and noticed that the engine was still ticking over. I selected neutral and the engine revved up as normal. I selected drive and the car drove away with no problems at all. This is the second time this has happened in the last two days. Any advice would be appreciated. The car is a 2006 300C 5.7 Litre hemi.