i have a 2001 s4 automatic 2.7biturbo and when i accelarate SLOWLYYY i hear some rattling noise coming from the front of the car please help thanxx

 

I had a rattle on decel for a while and it ended up being the wastegate arm being loose on the turbo. If I was fully off the gas on decel it would rattle, touch the pedal just a little bit and it went away. Total pain to get a wrench on, but there are two 10mm bolts on the WG flapper arm and try to move the arm a little closer to the diaphragm. Hope thats your problem!