Hi Mike,

Fair enough. I did some reading and found this article interesting. It is from somebody with a product to sell, so consider the source...

http://www.chevron.com/products/prodserv/nafl/auto/content/fueladd.shtm

What kind of gas are you using? I have had very bad experiences with low grade gas (EDIT: particularly in the wintertime),I don't mean octane levels, and now I only purchase this stuff...

http://www.toptiergas.com/deposit_control.html

These guys seem to have a service like the sort you want. No affiliation, but a 100% ebay rating over 500 sales is tough to get-so they must be doing something right?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33554&item=7997499157

This is the flow bench they use:
http://www.niehoff.com/whatsnew/whatsnew1.html

Let us know how things go if you send the injectors off! They apparently give you a before and after flow sheet.

cheers,
dan r.