Try spending $3.00 for a "Spark Plug File" at home depot. Run the file over the plug flange faces to make sure they are flat for optimal contact with your $200 receptical. I've seen huge ridges on plug flanges from stamping operation.
@geoffkait And @wylmars : I'm an Assembly language lover as well. Started my Programming career with Illinois Bell Telephone two weeks after ATT divestiture in January, 1984 (CRIS System). My biggest accomplishments: 1.Tweaked some code which saved 5 hours (clock time) from a billing cycle program. 2. Found an error on an IBM yellow card.
@geoffkait And @wylmars : I'm an Assembly language lover as well. Started my Programming career with Illinois Bell Telephone two weeks after ATT divestiture in January, 1984 (CRIS System). My biggest accomplishments: 1.Tweaked some code which saved 5 hours (clock time) from a billing cycle program. 2. Found an error on an IBM yellow card.