I dont know much about cars but i know that something is wrong with mine. I have a 2011 aveo ls with 85k miles. About a month ago the check engine light would come on and off and nothinf would be wrong with the car. Right now it jerks when its parked and when im gonna take off. Once im driving that im at a steady pace it goes away until i let the car and turn it back on. Like ill go out it'll start doing it and the after driving it for a good while it goes away. But after i park and turn it on the next day it does it again. Ive some research and i keep seeing spark plug, but then my exhaust is also making weird sounds like sputtering. Any idea on what it is and how much to fix it ?