why sunfire shaking

Wheel alignment, wheels could be off balance, tie rod ends or even uneven tire pressures. If your tires have an uneven weight from something as little as having half of one of your wheel covers broken off can cause a shake too. But not a violent one. Get your front end inspected. And when your drivin listen for a clicking/grinding kinda sound when your turning. If you hear that it's time to get your cv axle or cv boots replaced. You can take it to any tire shop to get all these suggestions looked at if a mechanic is not handy at the time. A tire shop would actually be better then a mechanic shop for something like that