Over the past 6 months or so I have heard a loud clunk while making a turn. Happened maybe only 4 times during that span. Yesterday while going 80 on the freeway I noticed a grinding or rubbing sound coming from what sounded like the front tires and at the same time I could feel a pulsation in the gas pedal. It would last about 5 secs and then go away and come back a minute or so later. Drove to work today and didn't notice the same problem. Worried it might be cv joint or wheel bearing and don't want to lose a wheel but the symptoms have been so sporadic that I'm not sure. Any ideas, thanks.