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A vacuum leak is one possibility. More info on the vehicle would help.
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∙ 10y ago
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When replaced thermostat car idles high?
you might have pulled a vacuum hose off
What causes high idle on 91 dodge stealth?
see previous answers, but if it idles high it might be the Mass Airflow Sensor. if your car idles too high for too long and you keep driving it, you could burn out the transmission module (very expensive )
What is the problem with my car..it idles high..and when i go to stop and then let off brake the car goes by itself?
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My car idles really high and wont go down and it will stall if I push on the gas!!
What if a car idles by itself?
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Why does car almost stall when started and idles high?
the fuel mixture is to lean and it is bogging out the engin or u need the idle control to be tweeked a little
If my car idles for a minute then dies what is wrong?
vacuum leak.
My engine idles too high?
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vacuum leak
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Broken/disconnected throttle cable
