Here are some threads...
The first one has a pick of the linkage spring for a 2.3 I believe. The second one has a pick of a 300E. Hope this helps...

http://www.peachparts.com/shopforum/showthread.php?t=109963&highlight=throttle+spring

http://www.peachparts.com/shopforum/attachment.php?attachmentid=18977&d=1086549453