as mentioned above , clean the idle control valve, remove and clean the pins of fuel pump and over voltage relay , Its Best if both are resoldered or replaced at this time due to ageing .
Its good to replace the rotor and cap together .the leads themselves do not go bad ,its the end plug connectors becoming conductive due to grime /ageing.
Air flow plate and inside area should be cleaned spotlessly with carb cleaner
regards
mak
89/ 300se