Hey Scotty, I have a 2008 Audi a4 2.0t, it's got a 6-speed automatic transmission with 91,000 miles on it. This car has been in my family for a while and has been extremely well-maintained. It has never missed a tune-up or oil change. when I start up my car it acts completely normal idles around 2200 rpm then eventually drops down to 750-800 ish. at that point, the car is very smooth no issues, but the second I put it into drive or reverse it starts shaking like a maniac, but once I get above 1100 rpm it runs smooth. I've gone to a few mechanics in my area and I've got various responses such as carbon cleaning, exhaust leak, and unbalanced crankshaft. I think something is wrong with the transmission but it shifts quickly and smoothly, and I don't have the knowledge to pinpoint it. if you've got any ideas I'd really appreciate it.