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Old Jan 12th, 2020, 14:44   #9
Clifford Pope
Not an expert but ...
 

Last Online: Today 10:11
Join Date: Dec 2001
Location: Boncath
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Also remove the Idle Air Valve and clean the sliding shutter. I find its soots up surprisingly quickly- even though it's only air going through it. I use a small artists's brush, fairly stiff. You can turn the armature inside using the wooden end of the brush, give a squirt inside with carb cleaner or WD40, and then the brush end to remove any dirt released. Finally blow through it to clear any liquid remaining.

Idling will also be affected by all the breather hosework - the flame trap, small hose to the inlet manifold, and the very small hose in the brass nipple connection to the manifold.
I think even the black box oil trap can affect idling if it is coked up.
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