I've got a couple issues... My audi has a rough idle but only when I stop. When I first start it is fine as well as when I'm driving. When I stop the rpm's bounce from 500 to 800 and finally settle around 8-900 where it sits smoothly idling.

Another issue I have is after a car wash - mainly undercarrige wash. It runs fine but studders under acceleration. Nearly to the point of stalling - although never does. At the same time this is happening, my speedometer no longer works. Give this about a couple hours and the car "drys" out and everything is back to normal.

And another thing, I replaced my battery and my radio is in safe mode... but that is another problem all together.

Any suggestions would be great... thanks!

'99(.5?) A4 1.8T quattro

 

you will need to go to the dealership and pay them to get your radio code. couldn't tell ya anything for the car wash thing besides that it's probably electrical.