My engine started shaking very badly at idle and then a little later the check engine light came on. The trouble codes are P0171 and P0441. I've checked the engine bay for any loose vacuum lines, broken connectors, etc and can't find anything. It seems that the issue is still there at higher RPMs but less noticeable. Help?

 

Model, year, engine?

 

Oh yeah. 2005 A4 sedan 2.0T

 

Make sure you're oil cap is tight, the FSI motors run like crap if its loose.