I know it is running rich cause i took it to a bloke how deals with proformance cars and he has an escort cossie rally car. He set the co mixture (on the side of the ecu). Last year for the mot i had to turn the mixture down to get it though the mot then i put it back to where it was. Is it ok for the engine to be running rich or would you recommend setting the fuel mixture to where it should be,normal.