Craig,
Don't have a Turbo, but reading your list, I don't see anything about new plug WIRES. That's a weak link in the ignition system. If you haven't put new wires on, Do it! It might be an easy way of fixing your problem.
If your wondering which wires to use...there's an on-going thread under Tech & Performance...
http://www.ptcruiserlinks.com/forum/...TOPIC_ID=14434