Tire viberation...
 

I saw a post a week or so ago where some one was asking about
vibrations at highway speeds and some one else suggested checking the
balancing of their tires. I was having the same problem myself and
took my 1987 Accord in to the tire shop where they found that the
front two tires were out of balance, the left tire needed a 0.75 ounce
added and the right one needed a 1.25 ounce added and now it drives
like floating on a cloud. Thanks to the one out there that made that
suggestion, it helped me!