It's not gurgling, just a more sort of throaty note when idling, and a mild chugging... sounds kind of cool, but its not so cool because you know it means something is wrong, lol.
Here's a vid
http://www.youtube.com/watch?v=Ie7uVKxONKs
Car has done just under 200,000km and the sparks from
OP have probably done about 10,000km