What would cause a 96 3.0 6cyl. caravan (base model) to stumble and stall out on acceleration?

I have replaced the fuel pump, fuel filter, and both O2 sensors (diagnostic ran at the car lot where I got it said O2 Sensor but he said it didn't say which one). Also replace both battery cables since they were corroded and it has a new A/C Condenser, Radiator, Fan Assembly and full tune up all done in the last month.