I dont want to "plug" up the thread, but when reading the plug.....Is the best case scenario....a fresh set of plugs with a good pull through 3rd then shut down and read.....correct?
The trick is to install new plugs, limit idling around or sitting in traffic, make a wide open pull in high gear through a wide RPM range. Then shut it down and coast to a stop. Pull the plugs and read em. Easy on a dyno, not so easy on the street.
