best spark plug?
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#8
#10
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It depends on what you're plugs coming out look like. You may need to go to a hotter or colder plug, but I would start with putting OE AC Delco's in, then pull them after 30 days and see what they look like and adjust if necessary.
#13
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Then, run them for awhile.
Then, depending what they look like coming out will tell you what direction is needed to go in, if any.
( running lean, carbon foul - tan, white, black, yada, yada etc. )