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Spark Plug Question

Thought I would try the "high price" plugs, MISTAKE! I am back to the HD Plugs using the narrow gap. Wont make "High Price" mistake again.
 
Thought I would try the "high price" plugs, MISTAKE! I am back to the HD Plugs using the narrow gap. Wont make "High Price" mistake again.

Knowing which and what "high price" plug would be helpful. A "Mistake" in what way.?
 
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