[j cAT]

did you get coolant on the distributor directly below the water pump? when the water pump is changed. i remove the knock sensors this drains the engine so that very little if any coolant drips down when pump is removed. also i believe 95 impala has old style of distributor that does not use venting that was used on 96 impala. this venting from intake plenum thru distributor and into intake manifold removes moisture and ozone gases that will cause premature distributor failure. I have read that very small amounts of coolant leaking will cause your problem. I don't believe there is anything else that you could have disturbed except the coil wires, that would have caused the loss of fuel and no start. usually it will backfire if distributor got wet and not start...........