Within the past week I have have noticed that my car starts to shake/rattle when I'm going 85-90 mph but then when i get into the high 90's it stops shaking.

Any idea what is wrong???

98 2.8 30v

 

I was going to say un balanced tires, but Id get your alignment checked an balance the tires. also check to see if the tires have scalping or feathering on them if so replace the tires.

 

I just got new tires 3 months ago, i will get my alignment checked and see if that fixes the problem
Thanks for the Advice.

 

i think it's the lack of a supercharger

PES is having a group buy

http://scaudi.com/sc/index.php?showtopic=3172

the rattle will be all gone once the sc is installed

 

tracking

 

Something like that is most likely not your alignment....
I would say your balance is very slightly off...
alignment usually causes your car to pull sideways....
I had a similar problem, 'cept it was at 60~65
since I felt it in the steering wheel, I paid $10 to balance front two, and walah! smooth ride