surging '95 Taurus

1995 Taurus GL with 3.0L engine, 360 000km.
When in park or neutral the car won't idle smooth, it keeps surging, as if someone were pressing the accelerator about once a second.
In gear it idles normally.
No problems otherwise.
Any ideas?
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Brenda opined in

Does it do same, warm and cold?
How about with heater in "off" position?
--
- Yes, I'm a crusty old geezer curmudgeon.. deal with it! -

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