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Uuuuhhhh.... What car?

After tracking down a real BEAR of a vacuum problem with my son's 97 ETC (code P0507 - High Idle), I now KNOW where all the vacuum lines should be sourced, where they're located, and what they do. One line especially, actually has a "hidden" connection to the intake manifold. I only found it by following the line on another ETC.
 

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Is everything (vacuum-driven things) working properly? I'm unclear as to what your stated problem is... High Idle? Is that all? It should throw a code if high idle is due to a vacuum leak (maybe a 94 won't). You didn't state if there are any codes. Do you have any codes?

I'm going to make the "unsafe" assumption that the SLS vacuum routing in the engine area is similar to an ETC. If you are talking about the vacuum tank that I think you are (lives under the battery tray on an ETC), then it's line has a vacuum check-valve in it. If you've defeated the reservoir which normally provides a rather constant vacuum on one side of the check-valve, then I think the resulting vacuum system (without the reservoir) will be instantaneously sensitive to engine load because the vacuum (from the intake manifold) is not dampened by the reservoir.

I learned a long time ago that when it comes to fixing complicated stuff, fix the stuff that you KNOW is broken first. Sometimes the broken item has side-effects that you never thought would cause the observed symptoms.

Good Luck!
 
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