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Originally Posted by TheDon
well perhaps a vacuum leak is to blame.. when the lines get warm(vac lines) they swell up a lil and will probably seal very well and when cold and not warm they let a lil vac out.. how well do your door locks work?
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Yup.
I bet you have some cracked, leaky vacuum hose/connectors under the hood. If I were you I would search for any old-looking hose and replace it, then see if the problem persists. Make sure everything is well-connected, too. If that doesn't solve the problem then I would start checking elements like the IP shutoff valve.
If it wasn't under the hood, the engine heat wouldn't make a difference leak-wise. I know this because I have a leak in my climate control system and the engine heat doesn't effect it at all, but if the ambient temp. is high enough the leak disappears.