engine wont idle

[threeonthetree]

Just picked up a 1985 chevy 4x4 with a basic 350 that has a carter on it and a 3 speed with granny low. truck ran flawless on the way home. it has a new motor with the papers to prove it.

last weekend my friends and i decided to see what the beast could do we drove it to the back fourty on the way we had to cross a ditch. the truck was bouncing pretty bad. as soon as we passed it the truck killed. i tryed to start it. pumped the pedal and it fired but would not idle.

if i give it any kind of throttle it runs like a champ but it wont idle? any ideas.

ive already replaced the fuel hose above the fuel pump and the fuel filter.

doesnt seem to be leaking anything.

truck also blew a brake line that i havent replaced yet could this be screwing with it.