I will not use NGK .
It started back when I was working in a motorbike shop , NKG would get slightly wet with fuel & would just quit firing , I thought technology had come a long way in the last 25 years since I was working on bike But back in sept a friend called me over as his car was running poorly , I knew he was having some choke problems but not bad & the car would just surge constantly while driving , he had ordered a rebuilt carb & installed it but it was running worse with it on , I took the carb apart & found some issues so I reinstalled the original carb & started tuning but nothing helped so we pull the wires & checked them , they tested fine , so I pulled the plugs NGK & they looked good, not wet or anything but I knew they had been rich with the choke issue . I suggested we change the plugs out , we picked up a set of the cheapest Champs we could find , just RJ12YC for 2.25 each & installed them , problem solved .