My 2000 Audi A4 1.8T quattro is having some problems. It keeps reving all over the place, sometimes doesnt rev at all and wont stay on at idle. When at idle it just stall out with even trying to engage. Do you know what this problem is? How to fix it?

 

Do you think it could be an ecu problem? Because I do have a second ecu.

 

1.8T Common Troubleshooting Guide

See if that helps you in the right direction.