I have a 94 z-28 and there is a rattling noise that is under the car in the front passenger side it starts rattling when im sitting at a stop light and idling i was wondering if anyone knew what it was or has had that happen to theirs.... it used to stop rattling if i put it in neutral but not so much anymore it still rattles .thanks.

 

Hey man, I would check the heat shield around your catylitic converter. Make sure that its not loose.

 

make sure your y pipe isnt loose and make sure all the piping isnt loose. mine started rattling after i got my y pipe welded to my cat when i put on headers. the exhaust place didnt put the hanger back on the cat right so it rattles a little while im just sitting sometimes.