360 stumbles when going from full idle to full throttle.

If this thing does this at a stand still (as in nail it and it stumbles)
You can partially cover the intake with your hand and pop the throttle open.
If the problem goes away with your hand over it a little, it's not getting enough fuel on the accelerator pump shot.
I have drilled them as much as 10 thou over to clean this exact problem up.