Yea, you're on the money. We changed 2 coils (cylinders 2 and 5) in my silver car today and erased the fault (misfire) codes. Went out to drive it again, the misfire code for cyl. 2 never came back. The misfire code for cyl. 5 came back...so then we swapped the coil/plug extension (I think thats what they're called) from coil 5 with coil 1, erased the codes. Went to drive and cyl. 1 misfire code came up!

So now we've narrowed it down to that one coil extension. See, when we ordered the 2 coils from audi they only sent us the coils, and no coil extensions...which I always thought those were included. So we were having to use new coils, with old extensions.

All in all, we solved the mystery for cylinder 2 (bad coil). And solved the mystery for cylinder 5 (bad extension and possibly bad coil as well). Now we're just waiting for the extensions (we ordered 2 just to be safe) to come in (either tomorrow or thursday).