hi, ive only had this car a couple of months, 2003 a4 1.8 turbo quattro. I need help with two problems, one is a knocking coming from the back end when a go from reverse back to 1st followed by a noise like im not giving it enough gas and my other problem, a weird knocking, rumbling when on full lock at low speeds and when stopping, sounds like a kind of rubbery noise, but neither of these happen when i take it to the garage. any ideas?????? other than these 2 problems, what a car!!!!!