I have a tire problem that I cannot solve. I recently purched an a4 (2005.5 fwd). The car had two different tires, pirellis on the back and some off-brand on the front. I have tried three different brands, the latest being Goodyear Eagles, but the car still rides rough. Mechanics can't find anything wrong anywhere . Alilgnment, bushings, everything including shocks are ok. Am I stuck? I am 60 years old and like performance, but the ride is horrific. The back of the car cannot be moved with my weight up and down. has someone likely made some changes to the suspension?