2003 Audi A6

Good day. i just bought an 2003 Audi A6 from action with a clean title, but 3 cylinders on the right side of my V6 are not working. The exhaust smoke appears from only one(left) muffler. cam position sensor replacement didn't help. so i'm thinking about buying a new wire set and spark plugs, but before that i want to check is this the ignition problem or not. my question is: how to test the ignition coils, wires and spark plugs on my Audi? if i'll test spark plugs using the way you explained here

http://www.2carpros.com/how_to/how_to_test_an_ignition_system.htm

will it be ok, or it will affect car's central computer?