1992 Mercury Cougar Q&A

1992 Mercury Cougar Question: car idles by itself

car brakes freeze up and engine wont quit running it just idles even while in neutral or park i have to slam it into park and turn off engine -
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When I start my car it immediately revs itself up high and then idles low. It repeats this process by itself until it eventually cuts out. It also does the same thing when I come to and stop and wi...
The Tachometer stays at about 3100 and does not move an inch, until I turn off the car. I assume it is just stuck, since the engine is not idling high. What would make it stick?