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Trapper
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444 Posts
If you can, I would say to do the plugs and wires first. There is always the possibility of getting a bad one of either, and getting that sorted out will save you potentially chasing your tail finding the problem after the tune.

Also, from what I have read, spark plug tip design can have a small impact on timing, in relation to when max. cylinder pressure occurs. That could impact the timing adjustment as part of the tune.
 
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