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Your Nissan may just idle high during the warm up of your engine. These cars are designed to do this based upon the fact the cars have an optimum running temperature. If they idle high when for the first 15 minuets it's to achieve that optimum running temp. If not then you may have a vacuum leak.

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โˆ™ 2011-09-13 17:56:06
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Q: What would cause your 89 Nissan Sentra to idle high?
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