What can be wrong with my car?

you may need to change the spark plugs...or it may be that the exhaust connecting pipes under the car, (near the catalytic converter) may be damaged.

My guess is it's a tire problem (a flat tire was plugged and the remnant is rolling inside the tire). At high speed the the remnant stays stuck to a spot inside the tire because of centrifugal force. When you slow down the plug no longer stays put and it starts rolling around. If you have a full size spare tire you can try swapping it with the tire closest to the noise. You could also try a tire repair / replacement shop. Good luck

Sounds as though you have a low tire. I'd check the tire pressure first, then if that doesn't cure the problem, you'll need to take it to a mechanic, who will probably check the suspension, and other items (most of which will be kind of expensive!)

there is somethin wrong with the engine like a glitch or you need it replaced but you should definitley let a mechanic check it out bcuz if you don't check it out soon then you could be in danger bcuz while your driving the engine might blow or something, I would have to be there in person to see the problem.

Sounds like a problem with one of your tires,maybe a flat spot on one of your tires or the belts might be coming apart on one of your tires,better have it checked just to be safe...

Sounds like it needs CV joints. Take it to the shop and get it checked.

Are you sure it isn't the pavement. If you are driving on a concrete roads, the separation between the slabs will make that exact sound when you are driving over them.

It's a Ford product and like any other ford I'm sure your lower and upper ball joints are rattling. You will have to take it to a auto shop to have them tell you for sure.

it could be something as easy and cheap as a tire balance problem, but without feeling this or hearing it myself it is impossible to say, it could even be a bad ball joint

I hate foreign cars because they are becoming more and more difficult to fix. Buy American cars, you cant go wrong.