1989 olds 98 vibrates over 45 mph

[sylvermist]

first of all,we might have some bad motor mounts. my friend said my car has 4 motor mounts. is that correct? it happened the other day. i was taking a turn to get on freeway when all of a sudden i had no power.the car started running really rough and im giving it gas, a lot of gas, and when i got to about 45mph it started vibrating really bad. so i had 4 motor mounts replaced and it still runs rough and vibrates around 45mph. what do you think?

[maxwedge]

Vibrates, from the engine such as a miss, from the front end, from the drivetrain?, too vague for any meaningful help.