This is a tough one ... since obtaining a car several months back, the car tends to produce a sound (not always though), which is very much like a loose plastic that rattles while going over small horizontal bumps ... but then again, it can start producing the sound while traveling on a straight road and it will continue to rattle unless I slow down or accelerate (like it is caused with the wind, pushing something loose, just enough to vibrate around ... now, the sound intensity is constant when