1197 Ford Escort MPC valve

Hi All,
I am a newbie struggling to learn to fix at least minor issues on our cars. Recently, our 1997 Ford Escort wagon (120K miles without major
issue) has been idling roughly, and almost but never quite stalling at stoplights after the car is warmed up. After spending the last few weeks reading on the Internet and reading my Haynes manual, I worked up the courage to purchase an automotive stethoscope, as all my research seemed to point to a vacuum leak.
As soon as I started the car and opened the hood, I saw, at least for this case, I didn't even need the stethoscope. I immediately heard a hissing sound when the hood was raised. I saw a small elbowed "valve" pointing into the manifold. The rubber just above where the valve actually attaches to the manifold was very squishy. It almost looked like it was soaked with oil (not a good sign, I guess?). The wearing on the rubber of this substance had worn holes on each side of it (the rubber), so that it was collapsing and I guess not allowing air into the manifold. As soon as I pulled up so air flowed freely, the engine ran fine. If I clamped it with my fingers, the engine stalled. It had "MPC" on it, so I looked that up, and tied that down to a "manifold pressure control". My Haynes manual does not reference this, and it looks like it is long tube that starts from the front of the engine and eventually goes into the manifold.
My two questions are:
1) How do I replace this? 2) Is the substance that has soaked and worn down the rubber an omen of something terrible about to come my way? :(
Thanks!
Steve
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snipped-for-privacy@gmail.com wrote:

MPC doesnt ring a bell.
Could it be the other end goes to the PCV valve? Or does it go to the fuel rail?
Do you use a lot of oil?
Replace the tubing with oil/fuel resistant and the PCV valve while you're at it, then drive it.
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snipped-for-privacy@gmail.com wrote:

Take the hose to an auto parts store and get a new piece. You can buy it by the foot. The substance that ruined the hose is oil, nothing to worry about.
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Thanks you each for your answers.
Backyard Mechanic,
Yes, it did go to the PCV valve. Thanks for the pointer, as that made my Internet seach much easier! I don't use any oil, ironically, or at least noticeably between changes.
ShoeSaleman,
I did exactly that (got a length of hose from Autozone), and I am good to go.
Thanks to you both!!!
Steve
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