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If the plugs have never been replaced, they are likely due. Pull them and do a visual and check the gaps. The suggestion to check alignment is good too.
At 100k miles, many maintenance items are likely due. Check the maint schedule in your manual. If you have a timing belt, that may be due for replacement too.
Low power or fuel economy can be caused by any number of things. A Chilton or Haynes book will list possible causes and have instructions for performing the maintenance tasks.
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