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how could u tell if u have a bad motor mount i went threw a previous inspection and he said i needed a motor mount but another said i didnt is it a way to tell like while im driving or while its running...also my car is runing roughly kinda diesling and has a small knock sound when i listen it sounds like the pulley but i suck when it comes to cars

97 deville 123k
 

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White Diamond '03 DHS (with DTS floor shift)
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Open the hood and brake torque it a little in drive and reverse. If a mount is gone, you'll see the engine lift.

Have you had the fuel rail recall done recently. Running rough might be bad ignition wires. That is a frequent after effect of the fuel rail recall due to moving old wires around.
 

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2015 Mazda3 S GT Hatchback 2013 Kia Optima SXL
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Ranger said:
Open the hood and brake torque it a little in drive and reverse. If a mount is gone, you'll see the engine lift.
Just keep in mind, that even with perfect mounts, the engine will move a little. Ranger is meaning some major lifting.

Don
 
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