97 chevy suburban

i went to drive this morning and while driving the truck stalled when i hit the brakes. i started it back up and it kept stalling. after a few times the truck wouldn't start. it seems to only stall when i hit the brakes or
if i'm in reverse and hit the gas hard, it will stall. is this a vaccum problem or maybe something with the fuel. the tank is a little low (by the red near empty) please help i have checked for bad hoses and loose ones also
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