To follow on, the cleaned valve was installed. The car was started in a cold condition and the rooms would steadily fluctuate between 1000 to 2000 rpm. After warming up for a good period the rpm settled in arou d 170p. Disconnecting the onboard ECU plug resulted in the engine going to around 3000 rpm. Based on input this would seem to indicate the valve is working? If so what should we be looking at to get the rpm in check?