I have a 2007 Mazda 5 with just under 20,000 km. Almost immediately after purchasing the vehicle from the dealer the car shook violently under mild acceleration. It has continued to do this on an unpredictable basis and the dealership technicians are stumped. I definitely feel that it is a safety issue that needs to be addressed for obvious safety reasons. Has anyone else experienced this phenomena? Can anybody describe their situation to shed some light on my problem? That would be greatly appreciated.