I have an 87 grand marquis and it has a bad shaking problem in the front end. It does it all the time. It might be a idleing arm. Not sure though if anyone has any suggestions let me no. Thanks.

 

I would check the tires. Could have lost a balance weight or a defective tire. Look for any bulging in the tires. If you don't see anything, try switching the tires to the rear and see if the problem moves from the front to the rear. If it does you know it is one of the tires. Sometimes the bulge could be inside the tire & not show on the outside. My Semi had a front tire, problem that could never be seen, but when the tire was replaced, the problem went away.

 

i would do what Bulldozer said... run your hand from outside to inside on the tread going around the tire... or you can jack 1 corner at a time and spin it some and look for a bulge... usually the problem is due to a separated tire where the steel belts in the rubber break and cause a lump from the lack of support within the rubber... with the issue, you dont know if the tire will hold up for a day or a year... the tire can blow out if not taken care of, tread can rip off and mess up body of your car also if not checked... not scsaring, just speaking from experience from working at shops and seeing this happen... had a back tire on a past car of mine separate and didnt even last a day and all the tread ripped off and banged up the body of the car from how it whipped into it