[DML] Missing idle mixture screw?

["vin4258" <vin4258@xxxxxxxxxxxx>]

Vin 4258 failed emissions a few weeks ago and after doing a tune up 
(plugs, wires, cap, rotor, air filter, oil) it failed again today with 
only minimil improvement.  Emissions tester says he thinks the O2 
sensor is ok because emission levels pass at high RPM (the 
sensor 'kicks in' at a higher RPM but does not affect idle mixture?)  
Next option is to adust the idle mixture screw, but when I go looking 
for it, it seems to be missing.  All I see is a hole with no apparent 
end but I do see threads.  What is this and can I simply put in a 
replacement screw or does this need major work?  I have never messed 
with it and the car only has 7k miles on it and this is the first 
emissions testing I have been required to get since I bought it...

thanks,

CRG








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