This unit came off of a 1972 455 Electra. I've read it's either for keeping the idle from dropping when the A/C compressor comes on or to avoid dieseling when the engine is turned off. I'm not sure which it is, but this one can be yours for $25, shipped to lower 48 US. Will mail to Canada, but shipping will need to be calculated. 6/29/10 UPDATE: THIS ITEM IS NOW ON EBAY http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=180526905702&ssPageName=STRK:MESELX:IT SO, IS NO LONGER FOR SALE HERE.
