1985 Broco II stalls...?

I have a Bronco II V6 Carborated (sp?), not fuel injected, we've replaced the battery, both fuel filters, new starter, checked all the vacuum hoses (replaced a few other things) did a complete look over, we can start it up just fine it will idle just fine sounds great, we can drive it to an extent tho, as long as we are accelerating (most of the time) it wont stall, but we hit the clutch and put it into neutral and not more than 2 seconds after that it will chug and stall as its starved for fuel we can start it back up again, but most times its difficult as we have to fight with it, some times it will just chug and stall when we're accelerating (very rarely tho) we're replacing the fuel pump on the side of the block what else could it be? just need good guesses at this point, we cant get the codes read on it since there's no one in our town thats close enough that has the connector.