sorry for the delay Michael.
what airbrush paints do you have?
one of the main issues with most airbrushes is the aircap, with a cocktail stick poke it through the hole and give a good turn to make sure there is no paint there, this is often over looked.
also it does depend on the airbrush, some of the brushes in ebay and amazon kits are mass produced chinese brushes, they can be very poor quality most of the time, and can cause an artist a fair amount of grief.
let me know what airbrush (s) you have and i can try to help more