So I currently have a 03 Lincoln Aviator AWD with 145K Miles. Ive put about 60K on that SUV. Recently the car shakes a bit to much when a come to a complete stop(either stop sign or red light) Also, when im in the expressway driving at high speeds, the car seem to jerk a bit. No lights for check engine, or check transmission. im planning to do a spark plug change,( which I changed on Summer 2016) and spark plug boots. As well as an oil change with some form of oil treatment. Any suggestions on what may control or prevent the shaking? Thanks crew.