The idle AFR should be 14.7:1 +/-.3. If yours is idling at 16:1 then I would log your fuel trims at idle - short and longterm, and see what those are doing.
Just as a general note... normally when you let off the gas the AFR will spike up (lean out) as the engine falls in rpm with no load. But it should settle around 14.7:1.
I am 80% sure I have an extra airbox in storage. You can use it as long as you need it. I won't be able to make the meet tonight, but I live in NW Reno and would put in on my porch if I'm not there. PM me for my number.
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