With the APR chip make sure the plugs are gapped properly. If they are gapped too wide, the increased boost pressure can snuff the spark, causing some misfires.

 

CYL 2 misfire usually turns out to the the ignition control module.

 

if you get repeated cyl 2 only after changing plugs and coilpack, i agree with the icm people.

 

im not tryna be an *** but... make sure ur actually changing ur coilpack on cylinder 2... i had a cylinder 1 misfire so i swapped packs from cylinder 1 to cylinder 2 n it came back with a c2 misfire... cylinder 1 is closest to the front of the car and they go back in order. but yea check out that icm

 

Yeah i just had to change my Engine Control Unit a month ago. It is also a 1998. I can almost guarantee that is the problem.

 

I have a 2001 audi a4 1.8t that has a misfire on cylinder 2&3. I have installed new coils, injectors, plugs and no change. It's always when first starting. Can anyone help. I have noticed that people have mentioned the icm but I can find it. When I bought the car years ago the stock air box had been removed so I can not find it.
help please