cabbynut

my car is driving me mental,i cant get the co above 0.18%,have checked for aif leaks, seems ok,have changed map sensor,throttle position sensor and (iat) sensor,have removed and cleaned the throttle body and idle air control valve,also checked the resistance across the co adjuster on the inner wing,thats ok too. am pulling my hair out can anyone save me ??? oh yeah if i unplug the iat sensor the co will go up to a normal level but is a pig from cold.