If the fuel filter on your car hasn't been changed in a while, you may want to add it to the list of things to replace.

"i'm also collecting web sites for parts (new and used)."

I doubt that one souce will have the best price on everything, so here are some places to compare for new and used parts:

NEW PARTS:

http://www.rprusa.com/

http://www.importpartsspec.com/

http://www.gapa.com/

http://www.nilssefeldtvolvo.com/

http://www.borton.com/parts.html

http://www.fcpgroton.com/volvo.htm

http://www.cybertroll.com/

USED PARTS:

http://members.home.net/stevekafasis/

http://www.volvousedparts.com/