1999 A4, 2.8L engine, 5 speed Auto.
Engine starts after long crank. Then VAG-COM gives me a message: "Multiple misfiring all cyllinders"
Above 2500 RPM works smooth, has power.
Under 2500 RPM start misfiring again.
Tested with VAG-COM.
Error message: "Multiple misfiring all cyllinders"
Anyone has any idea what's going on??
Thank you.

I found the problem.
If still interested, please read the new thread "Piston Ring Broke"
Thank you.