I have a 1997 Nissan Altima, when im driving,at a cruising speed with my foot barely on the gas and then i take my foot off the gas i feel and hear a strange clunk or somthing. it reminds me of a manual trans when you down shift and let off the clutch. i just bought the car it has 168,000 miles on it other than that runs great. i think it may have sat for a while. any sugestions would be helpfull. Oh yeah it dosnt happen all the time but it is often. Could the clunck be coming from my axls or cv joints