My 06 aveo was having same problem. I found a cracked vacuum line at the front of plastic plenum (dry rot). I replaced all the vacuum lines on front and back of plenum area. That fixed it and it runs better than ever.
My 06 aveo was having same problem. I found a cracked vacuum line at the front of plastic plenum (dry rot). I replaced all the vacuum lines on front and back of plenum area. That fixed it and it runs better than ever.
MetroMPG (10-19-2016)