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Why does my LS3 idle high

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Old Oct 10, 2013 | 07:03 AM
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Default Why does my LS3 idle high

I have an ls3 crate motor in my 61 vette and I am starting to have problems with high idle. When I come to a stop at a traffic light sometimes the idle will stay high around 1000 rpm's and other times it will drop down to normal. Any ideas what might be causing this?. Thanks, Bob
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Old Oct 16, 2013 | 04:50 PM
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does the idle come down when you come to a complete stop? is it only idling high when when you are costing down?
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Old Oct 16, 2013 | 05:12 PM
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Is your vss plugged into the transmission?
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Old Oct 18, 2013 | 06:12 AM
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When I come to a complete stop the idle stays high around 1000 rpm's. Sometimes when I come to a complete it will idle normal. It seems to idle fine when the engine is cool, but once it warms to operating temp. it won't idle down when I stop at a traffic light. Even if I hit the gas at a stop the idle won't come down. The transmission is a 5-speed manual. Thanks, Bob
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Old Oct 18, 2013 | 12:25 PM
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Can you post your tune?
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