1998 A4 concert radio/cd player not working

To be honest, unless there is something crtitcally wrong (unlikely, since the audi engines are pretty much bulletproof), then the only things that can cause idling issues like this are the ones mentioned before.

This problem can be caused sometimes by the lambda sensor, but this will show up on the MOT, so I wouldn't do anything about it just yet.

Try this... get the car nice and warm, go about 25mph in second gear, then floor it all the way up to redlinne. If you get any flat spots in acceleration then the problem has to be either MAF or split pipe.
If you dont have any flat spots, then it is only an idling issue, and the throttle body is 99% likely to blame.

If you have the VAG COM, then you can measure MAF and lambda, so that should remove some uncertainties.

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If you have the VAG COM, then you can measure MAF and lambda, so that should remove some uncertainties.

Try this... get the car nice and warm, go about 25mph in second gear, then floor it all the way up to redlinne. If you get any flat spots in acceleration then the problem has to be either MAF or split pipe.

If you dont have any flat spots, then it is only an idling issue, and the throttle body is 99% likely to blame.

the only things that can cause idling issues like this are the ones mentioned before.

This problem can be caused sometimes by the lambda sensor, but this will show up on the MOT, so I wouldn't do anything about it just yet.

My only concern is that I seem to be throwing a few pennies at this car.
I was hoping the MAF sensor would of been a quick fix. Obviously not and should be noted to all with similar issues the same.

Yeah the thing is, I want a good maintained car on low mileage. For a 2001 S4 (I'm looking at them right now) it will be around $10k for 100k miles. I bought my 2000 A4 2.8 for $10k on 49k miles. The cars are very much alike. So I was thinking I'll buy the engine, the tranny and the other required components and it will cost me around $10k.

But yeah I guess I'll just save up some cash and buy a decent one because you know hella a lot more than I do. Although I love the S4 B5, I'm just in love with that car.

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So the cost of the car is the thing and trying to buy bits here and there is not the way to undertake this project as it will cost you a arm and a leg, you need a whole car or forget it as it will be cheaper to by a S4 as an old one will cost you around £6k upwards for a tidy one.