"Plug Guts" & Weber Tuning

I think Daniel had a keyboard malfunction and was thinking "plug cuts", 
rather than "plug guts" (Or maybe he was watching Larry's road kill vid).  
Plug cuts are also known as "reading" a spark plug color to determine fuel 
mixture.  A description of the process and some other Weber tuning tips are 
located here:

http://www.teglerizer.com/dcoe/webertune.htm

Hope this helps,
Rick