What speed did it do the shake at? Mine generally does it at 20 and again at 40-44.. doesn't care if it's speeding up or down or staying the same.
Since I have an 06 (got her 2 weeks ago), I'm assuming I have the same code, right from the factory. One thing I find very annoying is it never wants to lock up in 5th gear, TC still unlocked until I give it a negative throttle blip, then it locks in and holds it to about 1/2 or 5/8 throttle. Somewhere around 15~20 psi of boost, then it starts downshifting.
Launch is horrible compaired to the 05 and 04's I've driven, it take at least 1 or 2 secnds before it starts making any boost. Heaven forbid there's any smoke or usable power from idle. Fvck the EPA.
If you already have it sorta moving, then nail it, it will just about rip the seat out of the floor. Otherwise it's a bit sluggish. I can't say it's all bad though, I nuked an 05 dodge from about a 20 mph rolling start on a hill.