Well sure enough when I put the airbox back on it started right up. Color me surprised. Still has the same issue though, or maybe slightly improved. I'd like to adjust the air screws while it's running but I don't have the right screwdriver. I can get a screwdriver bit on there but I can't turn it, so I'll have to hunt down the appropriate weapon.
I think something like this might work:
http://www.amazon.com/T19086-4-Inch-...=finger+driver