allroad questions

[Jeremiah Curry]

I bought a 2001 Allroad 2.7t tiptronic (with every option except the 6 spd
and towing) a few months ago, have previously owned 2 Coupe GTs, a 5000s,
and a 1991 200 20v turbo Quattro. There are three issues I need help with:

1. at light load the car has started to vibrate/shudder/growl. This only
happens at light load. I can be driving along at 20-80 and depress the pedal
a little and get a very pronounced vibration. If I let off it goes away
immediately and if I push harder I don't get it. Car has 91,000 miles. When
I bought it a check engine light came on and my mechanic ran the code and
said one CAT was starting to go, but not to worry about it. I tend to
believe him as it is fine at full throttle and redline.

2. One side of the car appears to be little higher than the other. When I go
to the lowest air suspension setting the tire on one side is a little lower
than the wheel well, while hte other side it is a little higher.

3. The parktronic just quit working one day. No beep when I go into reverse,
had been working fine.

thanks in advance.
Jeremiah