Spark Plug change interval?
I have a '86 coupe with cast iron heads and stock motor. how often do I need to change spark plugs? it's been about 12,000 so far.
I have replaced the injectors with ones from FIC and changed the distributor cap, rotor and wires when I did the plugs 12,000 ago.
I have not yet changes the one O2 sensor on the driver's side and I just turned 87,000.
not as smooth as it was under wide open throttle.
new fuel pump, filter and 40psi at the regulator