Q: I got a new fuel pump and filter and when my car is stopped it jumps up and down why?

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My car hasn’t been driveable for about a month. Took it to the mechanic yesterday and got a new fuel pump and filter installed. It drives well but when I am at a stop the car seems jumpy and feels like it is shaking up and down. However, when my car is in Park the shaking stops. Why is it doing this?

My car has 112000 miles.
My car has an automatic transmission.

It’s either motor mounts or an engine management fault (ignition, fuel, air induction, etc. but also including uneven cylinder compression and mechanical issues) or perhaps a combination of the two. The root cause(s) of the problem can be pinpointed if you request an engine vibration diagnostic. To evaluate motor mounts, you can try shifting from "neutral" to "drive" and back, while the engine is running. If the vibrations disappear or reduce dramatically in "neutral," a possibility is you need new engine mounts. All other tests will require sophisticated diagnostic tools and hence I encourage you to request the engine vibration diagnostic to get this resolved. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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