Hi,
I have a filled motor mount on my 2005 Aveo. I bought a used replacement, filled it and installed it.
This will firm up your engine and make it more responsive. Here is a link to a post from when I did this to my Aveo.
Aveo Motor Mount Filling Take 2 | Unique Motorsports
Attachment 8718
Attachment 8719
Attachment 8720
Attachment 8721
thanks,
Chad