Tuning a 1500 Midget (1975 with 150 ZS CD carb)

[Adrian Jones <adrianjones747@earthlink.net>]

Hi again,

Lacking a CO analyzer, I've been going by the color of the spark plugs.  Black 
sooty plugs and only getting 22 mpg (US gallon).
  
Then I accidentally disconnected the hose from the carb that T-bones the hose 
from the charcoal canister to the valve cover.  The car ran noticeably better 
(felt like it revved more freely) and the plugs went to a nice light brown 
color.

Obviously, I canbt leave it like that b grit getting into the carb and valve 
cover.
Any thoughts?

Regards,  Adrian