what is causing really rough idle.
Rough idling engines can typically be caused by ignition system or fuel system failures. This can be things like spark plugs (https://www.yourmechanic.com/services/spark-plugs-replacement), spark plug wires, distributor cap, distributor rotor, the distributor itself, fuel injectors, fuel filter (https://www.yourmechanic.com/services/fuel-filter-replacement), fuel pump (https://www.yourmechanic.com/services/fuel-pump-replacement),...