It's been kinda fun watching guys over the years getting sucked into every little trick in the book over the years. Around 42 years ago I asked an old time mopar engine builder is question about an issue with the 340 in my duster back in my street racing days. When I told him what my car was doing he looked at me and said, You are using Champion spark plugs aren't you? I told him I was and he told me to throw them away and put a set of Auto-lite plugs in there and the issue would go away. I put a set in that day and have been running them ever since. Zero complaints