Bad Vibrations

[Smith1234]

I have had my mustang (94, 3.8L, manual) since Jan and had no real issues with it except a bad transmission mount that was replaced 2 days ago. After i picked up my car from the mechanic and started to drive it i noticed it sounded different under acceleration and had a bad vibration which wasn't there before. The power doesn't seem different it just feel different like something isn't right.

At idle there is no vibration until i rev it up to about 1000rpms and its starts to vibrate bad and it goes away at about 1500rpms. But its always there during driving (anytime the gas is pressed at any speed) but if i let the car coast it settles to a min. I am hoping someone can help point me in the right direction. Thanks.


The mount that was used was a poly mount by Energy Suspension