well i know that as cars get older they start to creak and groan more.most people say just gotta live with it.i tend to think that even noises can be fixed.i also know that if i had pictures and video it will help more..im working on that.anyway this noise seems to come from under the hood,but you only hear it when you are in drive and stopped with foot on brake.it sounds like a heavy vibration being transfered throughout the car,driver door vibrates.its also rather loud.but as soon as you hit the gas and go all is normal and the loudness and vibration disappears until you stop again at a light or something.if you put in park or even reverse hardly noticeable.also i have noticed that if i am in drive and stopped and i pop the hood most of the noise goes away,so is it my hood.ive also noticed that the hood doesnt seem to line up completely flush with the front end.also while we are on the front end,my friend whom does mechanic work says these pontiacs are notorious for becoming not so tight and loosing clips and such.what should i do?have you experienced this?