Transmission problems are common in this model, often as a result of a failed front pump. The pump loses its ability to create hydraulic pressure, which an automatic transmission needs to function. A sign of front pump failure can be a whine type noise.
Transmission Problems Common Due to Front Pump Failure on Mercury Mystique
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has a whine when you press on gas also you have to let off the gas before it will go in gear then it will go slow has slippage feels like it goes into neutral before it goes into drive from second
I have yet to have this problem fixed due to the fact that I'm not sure what is exactly wrong with my car. The transmission acted as if it could catch the right gear and would jerk. Now it's worse and takes a while before it will even go into gear