Hello, 2003 Element EX runs great 95% of the time. Every so often I will be driving along and without warning it will feel like you are going over those rumble wake up strips that are on the side of the interstate. This might last 2-5 seconds then quit. It is starting to occur more often. Any ideas on what is causing this would be great. Really notice it when driving around 30-35MPH because that is all the faster my wife will let me go since it is her rig. Thanks.