I appear to be having the exact same issue, and its rather annoying to say the least, although from reading through various posts, it appears the same symptom can occur for different reasons?
id like to walk through my logic with people that have had this before to see if you come to the same conclusion please.
I have a 1999 1.8T A3, AGU engine with old style coilpacks, and the car intermittently judders at low revs, and lack of umph to accelerate, sitting at idle its not very healthy, puttering so to speak.
>ive been through the coilpack test, however disconnecting all of the coilpacks one at a time gives the same result, more juddering in the engine... so that would imply that my coilpacks and cylinders are fine then?
>If my coilpacks are ok, then in theory the N122 (ignition amp module) should be ok, otherwise the ECU wouldnt be sending the signal to the spark plugs via the coilpacks, and one of the coilpacks would appear to be faulty would it not? I can go through this test if needs be
http://forums.audiworld.com/a4/msgs/1594531.phtml
but im not convinved I need to given the other test.
>So considering my car is due for a service and given the above plus symptoms, would it be safe to say its most likely the spark plugs causing a missfire? I could do with changing them but what would people recomend? im not going to be chipping the car or anything, plus might be selling it soon, so just need to get something to fix this issue...
any thoughts? am I way off here? have I missed something?
cheers