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I'd put a fuel pressure gauge on it so you can see what the rail pressure is when it won't start. Sure would help in diagnosing the problem.
Did yo put in the approved plugs or some kind of "super-hype" plugs? These engine "like" the approved plugs better than anything else. Also are you using high octane, and if so you could try switching to mid-grade for a few fill-ups to see if there is a change. I've also heard of problems like this when the weather starts getting colder and the fuel being purchased is still a summer formula (usually the gas station will have no idea if the fuel is still summer formula or not, but the summer formula gas can be a problem in cool weather)
Gilly
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