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I got no responses, but the answer ended up being the battery. Yesterday the original battery died, and the installation of a new battery solved the problem--the idle is now as it should be without surges or jumps.

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Q: Why does 2001 Ford Focus ZTS idle jump then the electric fan comes on even when cold--runs for awhile shuts down repeats Refilled AC r134a but did not fix it--engine coolant oil good ideas?
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