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When was the last time the spark plugs were replaced and what where they replaced with?

The other question is what grade of fuel are you running? (Regular/Mid/Premium) And is it hotter now than usual?
 

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I've seen one user here suggest using an extra half foot-pound of torque when tightening plugs. There have been others that have found their engines "chirping" that was traced to loose plugs. I think yours may be the first with performance problems. But this engine is plug sensitive, so worn out plugs will do it.
 
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