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Discussion Starter · #1 ·
OK, actually it is a '97 mercury mountaineer, same as an explorer. The big V-8
It has a bad vacuum leak under the intake manifold, there is a little plastic looking fitting, which is sucking a lot of air, very loud, and seems to be effecting the brakes, especially when backing downhill. This fitting is on the left side, all the way back towards the firewall, going into the side area of the manifold, that is just above the head. It sits back behind two metal lines and is hard to get a good look at. I didn't see any loose air lines near it, and when we plug it it runs quiet for a while, but then the engine dies...

Any thoughts?

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