It should just be your idle screw. It's a massive one that will move the throttle valve when turned. Turn it in a bunch until the throttle is visibly open, turn the car on, and back off the screw until it idles nicely.
All with your air filter housing off, of course.
I got a new shell, just need to stop driving the DX so I can work on it.
I've got a filter for my mouth, it just isn't a good one.