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Does anybody know what affects you can have when you turn the idle speed adjusting screw to any position.

What is the correct position for the honda civic VTi (SIR in the USA) 1994 hatchback model.

This may be the cause of the problem that i am having when driving on the motorway. When i drive at around 80mph on the highway the engine light comes on flagging error code 43 (Fuel Supply System). Could the idle screw be the problem as it can effect other sub systems ??
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