Question about 2005 Ford Futura
Sounds suspiciously like it could be the Idle Speed Control (ISC) motor on the side of the throttle body. They can tend to carbon up and become sticky. Try removing it and cleaning it out with throttle body/carb cleaner. This motor controls additional air into the inlet system. If it is sticky is does not react smoothly and in time with the request from the ecu, it will cause hunting. It may also be a good idea to check the oxygen sensor while your at it, although surprisingly, in all the info I've got I cannot find resistance figures for it.
Posted on Aug 22, 2009
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Posted on Jan 02, 2017
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