I have a 2005 Nissan Altima with about 16,600 miles on it. I purchased it in 9/2004. Whenever I accelerate, I hear a rattle noise and I am assuming it is coming from under the car. Can you please tell me what this is. The dealership says I need a fuel injector clean out and throttle body clean out for about $200.00. This has been happening for at least four to five months or more.[/b]