An alternative thing to consider.

If you have the fuel purge system that draws off vapour from the fuel tank and chucks it through the charcoal filter and then into the inlet manifold you might find that excess fuel is reaching the system via this route.

Chapter 47 - 200 says to disconnect this system from the inlet manifold when performing tasks such as setting idle speed.

If this makes a difference then it might be time to replace the charcoal filter as well...

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!