I have a 2000 Audi A6 2.7t and Im getting no spark on cylinder #1. 2 days ago the car started to run rough I got out looked around closed the hood and problem went away. Then yesterday driving the car the problem started again. I have changed the coils around and the no fire stays at cylinder #1. New spark plug and still no spark.?.? I know the problem is no spark but Im not sure what could be causing this on just one cylinder. Any ideas?