Had a faulty water pump. Replaced timing belt, pulleys harmonic balancer ,etc. Replaced thermostat and water inlet tube gaskets. Pulled the thermo housing and distributer. Put back together and number four cyclinder wasnt firing. Found a bad rotor button in distributor and replaced button, cap and wires. All cyclinders firing now but idling very rough and stalls when driving when i come to a stop. Anyone have any ideas?????? Im tapped out of them.