I'm i little confused, have you stated it since it came off the track?
If you lasted tried it on the track it maybes because the engine had nipped up with the heat (metal expanding) and no oil, so if you tried when it had cooled down it might start up. My mates clio used to just stop at junctions etc and in the end it because it had basically no oil in and the engine was nipping up tight, fresh oil in and still runs to this day.
Id guess the pick up pipe as well, I've had two 2.0 tfsi's and changing the pipe up was one of my first jobs I did after hearing the stories, both were very clean but it gives me peace of mind.