High speed vibrations?

I own a '95 Celica GT with 90k miles and have been having a lot of issues lately....This one has to deal with high speed vibrations. I've always had a lot of vibration on the steering wheel and gas pedal at speeds in excess of 60 mph. I thought it was just the tires being out of balance. I was planning... show more I own a '95 Celica GT with 90k miles and have been having a lot of issues lately....This one has to deal with high speed vibrations. I've always had a lot of vibration on the steering wheel and gas pedal at speeds in excess of 60 mph. I thought it was just the tires being out of balance. I was planning on getting new wheels/tires soon anyway though, so I didn't worry about it. Well, after gettting new wheels/tires (that came balanced) the problem did not resolve itself. What else could be causing the vibrational issues?
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