shifting/ waving body motion

Sounds like bad tires or u need a alinement

Also check the steering box

ok thank you. they are fairly new tires, the guy had just put them on when he parked the car in February. i got the car about a month and half ago.

There are a number of things to check that hasn't been mentioned here: Control arm bushings and Ball Joints are the leading cause of wandering. Also, loose tie rods (inner and/or outer), shocks/struts, mis-matched tires etc. Many local shops will do a chassis evaluation for around $20. They'll hoist it, give a wiggle, shake and a couple of pokes with a pry bar and tell you exactly what they find.

Well I think I found the problem. Went to do an alignment and noticed the rear passenger tire was moving side to side. So looked it up and its the control rod!