I have 2K Altima SE that has started making a rattling sound (metal like sound) when I first hit the gas pedal. It happens at different times and doesn't always happen. I have had it in the shop several times and they can't find anything wrong with it. Has anyone had this type of problem before? I'm thinking it might be in the exhaust since that is the only thing that hasn't been checked.
Also, I have got to purchase a new radiotor for it as well. How much is that going to set me back?
Thanks, Daniel