LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

high idle when started?

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Old Mar 12, 2004 | 08:16 AM
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rocmemphis's Avatar
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From: Memphis, TN, US
high idle when started?

I am pretty sure it is a vacuum leak but just wanted to get some opinions.

When I crank the car sometimes it will idle up to around 2500 RPM and hang there for a few seconds before coming back down to 850. Does this sound like a vacuum leak? I have some other problems that may or may not be related but I keep thinking that I might have a leak in between 2 ports in the intake manifold.
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