Blow-by fouled plugs shouldnt konk out a 6 cyl completely dead that consistantly but flooding will.
Yes you can clean plugs with a wire brush and refit. They are pretty robust.
Common causes of low/rough idle are things that affect the air+fuel+ignition mixture:
Split vacuum hoses/fittings on intake,
Blocked fuel filter/lines,
Faling fuel pump,
Blocked/rusty fuel tank (old fuel).
Faulty efi sensors (CAS, Coolant temp, Air temp, AFM, TPS, MAP),
Corroded efi plug/connector terminals (Engine temp, Air temp, AFM),
Faulty FPR,
Jammed EGR,
Sticking AFM,
Broken PCV,
Failing CAS/Ignition module,
Dirty/leaking fuel injectors,
Shorting leads/ignition coil,
Worn dizzy cap/rotor etc...
Most old datsuns burn oil thesedays. Dont sweat it, just keep topping her up...
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