I have a '04 grand prix and when driving I hear rattling in the tires most front and possibly the back any idea of what this could be?
Ever change out your struts since you've owned the car?
It could be a number of things, your wheel bearings, your rotors could be warped, any cosmetic plastic cover caps, loose or broke of brake pads or parts tumbling around inside. Also you could have cupped tires. I would suggest you take it to someone who is certified to work on it. you dont want a safety issue.
Search Pontiac Grand Prix Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Pontiac Grand Prix Experts