CO relates to fuelling, youre running a bit rich. Give the car a fuckin roasting before its tested, make sure its right up to temp, cars run richer when they are cold. Do you have an adjustable FPR? If turn it down a wee bit just to get you by. Try taking the air filter off if you can, this will allow more air in. Do you have a CAT on the car? O2 sensor ok? Coolant temp sensor ok?