Plug Readers Chime In

doc540 said

VP Racing Fuels, local from the pump

Regardless of what it really IS, my Slant idles smoother, runs better, and gets better mileage.

Click to expand...

What I was getting at was, with ethanol and high quality fuel, it is sometimes difficult to get a good read on plugs. Although I have been hard headed in the past, AF meters are probably your best bet.