I know there's a lot of these threads out there, but most of them pertain to R33 so I couldn't really find anything to help me.
I put my car on the dyno a few weeks back, and the car was missing quite heavily. So I changed the plugs to NGK 6ES items (I think ... something like that anyway). They were gapped to 0.8mm so I left them like that and put them in the car.
Put the car back on the dyno and it still seems to be doing it. At night time I can notice it the most, but only when I'm gunning it. It sounds like big popping noises coming out of the exhaust.
Could it in fact be fuel? As I had the SAFC tuned only 2 weeks ago.