Just wondering what kind of GAP the plugs had?
Have a read through the technical tips here http://www.ngkspark.com.au/ there is some VERY useful info about plugs, gapping, heat ranges etc.
FYI, this site recommends Platinums as the standard factory plug for my car, not sure about 32's or 33's though.
That site is better than www.ngk.com.au as this one doesnt have any skyline imports listed just the local 31's etc.
Well worth a read through the tech tips if you wanna know a bit more about ignition / spark plugs etc.
maybe add to sticky list