Motor dies when putting on brakes...

What are the causes of this so that I can try some different things. I really need to get a good tune on it, and my plugs are shot I think as well so that is part of it I think but it idles fine and runs good just dies when braking/letting off gas quick.

Anyone?

only thing I can think of is that hose from the brake booster going to the intake manifold might be worn out, loose or connected wrong...

i think the idle was way too low and also i think my mixture is off. i dont think brakes have anything to do with it after going a around the block again.