My 2006 Chevy Cobalt LS shakes and it has a rattling sound then it will turn off.?

[Leilani]

My 2006 Chevy Cobalt LS shakes and it has a rattling sound then it will turn off. We have changed the oil and sparkplugs. Based on what the Autozone diagnostics told us. They said it had a misfire sparkplug. After, we made the corrections the car stopped shaking for about two days. Now, the car is doing it all over again. Can someone help me figure out the issue? Please. The car also turns off out of unexpectedly without no reason.

 

[Whoa D]

If the problem stopped after you fixed it maybe you found the problem but didn't do it right. There are lots of reasons for a misfire. If you have automotive experience then autozone can be helpful to get free codes read. But unless you want to put the livelihood of your car into the hands of low paid autozone workers,just take it to a shop that doesn't guess your problem. Id guess you or someone might not have tightened the spark plugs or maybe misrouted the wires and exposed them to heat which will destroy them and cause a misfire.Or you could have a vacuum leak.