Since my wifes 1985 escort was motted ,it has been sick. I suspect they have damaged the carb mixture screw as the co analyser readout is extremely low . The engine revs go up and down every second and screwing in the mixture screw (VV carb) makes it worse . Haynes says screwing the mixture screw weakens but is hunting cause by a rich mixture?.The plugs are getting sooty also. I have put in a new cb and checked timing. ? thanks for any light on cause of hunting
Steve