2000 Mustang

[Missouri Girl]

So I got the car in May and if let off the throttle my car vibrates. If step into it or press the brake, it stops. I've replaced the u-joints. What else could be wrong?

 

[COramprat]

Could be motor mounts or transmission mounts.

 

[Missouri Girl]

No that shouldn't cause a vibration. That would be more of a hard jerk when you shift gears

 

[usaf_branham]

Actually, yes it could be motor mounts... Or it could be an improperly balanced driveshaft, bad control arm bushings, improperly balanced tires, or a number of other suspension / drivetrain related issues.

 

[Missouri Girl]

Oh. Ok. I was just going by what another mechanic had told me. Thanks for the info. I'll get those checked

 

[COramprat]

Control arm bushings, in my experience, is more of a rattle over bumps. What you described is how my old 96 GT acted when the motor mounts were messed up after an accident.