Alright after many hours of tooling around trying to resolve the problem of my SU Carbs on my 260z popping while accelerating (while engine was labouring). I pulled my old NGK Spark plugs, and replaced them with a brand new set of Bosch Platinum plugs, and the car drives like it was brand new. She pulls hard in all gears, and the popping has completely stopped. There was prolly some misfiring or fouling with the older NGK's.

I'm only posting this, incase someone else out there has the same problem.

 

Just the single prong ones, i couldnt find anyone who stocked the multi prong ones. and when these plugs go bad, or need replacement i'll consider upgrading to the 2-4prong ones.

But i cant say enough good things about these plugs.

 

True, however....once the "closest" prong becomes fouled or reaches a higher resistance than the other prongs, the spark will begin jumping to an alternative prong. Anyway that's the theory.