Car Shakes on Idle and Is Weaker Than Usual
 

Hey there guys,

I have recently rebuilt my engine in my 2002 A6 4.2 V8. I replaced the valves, gaskets, water pump, oil and oil filter. I was able to get the car to start and it seemed to be working smoothly but with the check engine light on.

I took it out for a test drive hoping the light would turn off but I discovered some problems:

When in idle the car shakes more than it should, and also when I step on the gas it is very weak. It's not showing it's true power... I set it to tip-tronic to try and get some power out of it manually but it's still very weak and doesn't want to pull like should.

I am also seeing this message constantly: https://i.imgur.com/hIInT.jpg

Even after resetting it.. Also the check engine stays on and sometimes blinks...

Can anybody help me out with this?? I don't have the computer to check the codes..

Thanks!