What if...
...switching from NGK 6 style spark plugs (the 'standard' option) to NGK 7 style spark plugs (the option in the Owner's Manual for 'extended high speed driving') was the cause of the "cold stumble" on cooler days?
What if...
...switching from NGK 6 style spark plugs (the 'standard' option) to NGK 7 style spark plugs (the option in the Owner's Manual for 'extended high speed driving') was the cause of the "cold stumble" on cooler days?
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