car shakes at 80mph
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i was making the 1200 mile trip home yesterday and i was on I40 and the car was runnin fine then i got bored so i started playin around and when i got to about 80 the car would start shaking and as soon as i brought the speed back down it would stop. it wouldnt do it under hard acceleration but if you would bring it up to a constant speed and it would start to shake, i pulled over at the next gas station and checked the tires and i aired all of them up to 40psi, looked under the car for anything loose and couldnt find anything, i cant figure out what it is but it scared the **** out of me when it first happend, any ideas?