New Spark Plugs at 8,000mi?

Same symptons as FastRnu2.
Had changed original plugs with 28,000 mls on them and had been running just fine, but with only 20,000 mls on replacements started running really rough below 3,000 rpm.
Thought it might have been fuel so put through an additive, then checked exup valve, then changed air filter but plugs were the problem.
Thanks for the thread FastRnu2:beer::thewave:
 
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