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My 91 did that and it was the ECM. It would jump to 40-45 while idling (Even tho the car wasn't moving) and if you were going down the road - it would jump to sometimes upwards of 100 mph (At 50-60 actual speed).

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Q: Why does the speedometer on a 1988 Olds 98 Regency rise to 45 when ignition is turned on?
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