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That's a pretty fat AFR and I've found that checking thru the tail pipe (exhaust) to be a bit off...right behind the collectors in the straight pipe to the exhaust seems to give a more honest reading...if you mount one that's where they will recommend.
Too rich at idle will cause surging but should be no issue at WOT.
I'd just change the wires right now....(not sure about your test fig. tho if good/bad) and do one item at a time so you can isolate the issue.
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De Oppresso Liber
Strength and Honor 5th Legion
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