My 1997 ford expediton seems to wobble a little

rotor warp--brake caliber ---brake pads---wheel balance--loose lugs--suspension

Check the lower ball joints, lower control arm bushings, sway bar links, and sway bar bushings to the frame. Could be a broken sway bar also.

The dreaded death wobble". Check this video which I always watch as he goes into detail how to really fix it. A lot of info is also available at jeep forums. Check jeepforums.com too. http://www.youtube.com/watch?v=gVJx8buTE8I

have u had your car lined up at a aliment shop if not your toe end and camber could be not adjusted right

There are many things that couls cause the wobble. The main ones are a tire or tire pressure issue or you are in severe need of an alignment. Start with that first.

are the tires ok , maybe a separated tire will cause
a wobble.

most of the time, it's the trac bar bushing. if it's worn, you can death wobble over 40 mph. replace it with a polyurethane bushing.

How are the tires wearing, could you need an alignment? Is the anti sway bar broken? When I hear that you have a clunking noise while accelerating I want to blame your CV joints, are you sure they are fine?

Steering dampner (thing that looks like a shock absorber mounted sideways) can cause this. Most good alignment shops will check front end components for wear (shame on them if they didn't) but sometimes what seems like "acceptable play" if added to other components in similar condition can add up to a total of unacceptable...If dampner does not help, I'd start eliminating anything with any wear. A side-note to this is about caster angle...I never like factory camber settings...it does make steering easier but I prefer setting caster at least one full degree (+) past factory settings. This makes the vehicle more stable at higher speeds and often eliminates tendency of wheels to wobble. (won't go into full details, but it's why you can ride a bicycle with "no hands" if you turn the fork around and try that you will land on your ****!) If adjustable, it involves placing equal thickness shims on both sides, behind rear of front lower control arms. Changing this may alter toe in, so that should be re-set.

try doing your tie rod ends or ball joints and check the sway bar link pin rubbers