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Inconsistent idle

Fuel System

Model: 964, Year:1991, Mileage:163000, Type of use:Street use only
Occasionally, as in often in wet or damp weather, my engine won't idle, the revs will drop to zero and the engine will die. During drier weather the engine will idle though sometimes it may not stay at an even idle speed. I replaced the idle air control valve with no effect. The engine is not chipped and has the stock clutch.

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