Why does the rpm's rev up and down when you turn on the heat in a 1997 Ford Taurus?

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To get a wide power band and rpm's you need ... curve farther up the RPM ... as it takes the final turn at like 6-8k and then accelerates down the ... - Read more

It revs way up then tries to settle down but does ... then back on and see if it revs up. Is it a constant rev at 1.5K rpm or is ... You can find all Ford Focus and ... - Read more

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