JUST BOUGHT A 92 DEVILLE AND HAVE SCINCE NOTICED A BAD WHEEL VIBRATION AT HIGHWAY SPEEDS (65+) AND UNDER LOAD (AROUND 40MPH). IF YOU LIFT OFF GAS IT STOPS. IT 'FEELS' LIKE ITS COMING FROM THE FRONT PASSENGER SIDE WHEEL BUT, IM AN IDIOT, SO IM NOT 100% PERCENT ON THAT. THERE IS A PULSING UPON BRAKING FROM THAT CORNER, SO THE ROTOR IS WARPED AND NEEDS REPLACED. THE ANTI LOCK COMES ON AFTER DRIVING ABOUT 10 FEET AND REMAINS LIT. THE TIRE ON THAT SIDE IS WORN ON THE OUTSIDE EDGE SO I KNOW THERE IS ALIGNMENT ISSUES BUT IM TRYING TO GIVE ALL CLUES FOR MORE ACCURATE DIAGNOSIS. THANKS IN ADVANCE FOR ANY EFFORT

Check the wheel bearing.