Car is a 2004 4.8is. Maintenance history is here...
https://docs.google.com/spreadsheets...gid=1979265047

While driving today, my car all of a sudden started stuttering, hesitating, won't go over 30 mph without feeling like the idle is going to die. I basically had to limp it 4 miles home around 20 mph. Once I go passed 25 - 30 mph, the car starts stuttering hard and feels like it's not getting any gas or spark...not really sure.

It kind of reminded me when I had misfire on my e36, so when I got home I changed out my spark plugs to the OE NGKs. Problem was still there. I though I read it might be the torque converter, but when I drive the car using "steptronic?" and shift gears manually, it still has the exact same symptoms.

I tried using INPA to get the error, but this was the best I could do. Does this mean anything?