For some reason lately my a4 has been idling rough. Not really the engine but it sounds like its puttering. Like it has a hole in the exhaust. When I take it to my local muffler shop they said they can't find a leak. Any1 might know what it is? And also...what can I do to clean my fuel injectors besides put in fuel injector cleaner in my gas tank.

 

I have the same issue, did you ever figure this out? Thanks!

 

For what it's worth, posts like this get ignored because we don't know the motor, the year.....anything.

 

1997 1.8t

His fix was replacing a hose that had a leak in it, he didn't say specifically which one...but likely a small vacuum leak.