I have a 2011 aveo⁵. Head gasket was bad so I took it apart. The head needed cut. It took about .030" to clean it up. Put in a new head gasket ND timing belt. I got it running but idle is rough. I push the gas and after coming off of idle it runs great. Any suggestions? I did have the cam pulleys off to cut the head. Also bought the tool to line them back up.