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Q: idles very high at startup on 1990 Buick LeSabre

after starting can hit speeds of 30-40 mph without touching gas pedal, when I get home (about a mile and half drive) put in park engine reeving really high. if I let car warm up for 10 minutes usually have no problem
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yes kind of figured that, was hoping that there was a common problem with car, hi ho hi ho back to the mechanic, thanks for your response
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