I will check readings my Plus 8 in the next few days.
According to the MOT emissions report there was a pass of CO at idle, the failure with CO was at fast idle, did you have a snapshot of a fast idle
R2967 is the standard tune (PROM)
One item that came up some years ago was an issue if the Mass Flowmeter body was not electrically isolated, maybe a heater hose or a grounded item touching it, haven't experienced the problem myself
Checking the tests on my Plus 8 in the last two years it tends to scrape through CO on idle, but sails through on fast idle
Years ago I had a hesitant running issue with the +8 on checking the airflow meter I found that it was not electrically isolated and the heater hose was causing a grounding resulting in faulty readings. Wrapped the hoses checked the meter for grounding all clear and never had the hesitating again.
