Originally Posted by hammertime
Get a champion or stay with the autolite, there was a loss in HP just putting the NGK;s in mine ..
seen more ngk's cause a miss then any plug
Maybe you had the incorrect heat range? I used to run #9's years ago and had problems with a top end miss after a bit. Dropped down to #8's never missed a beat.
In fact the plugs I have in mine now I put in last spring, still popping off perfect, just wanted a fresh set.
I've heard good things about autolites too, only thing I'd put a champion in is, my lawn mower :shock: