Quote:
Originally Posted by cotbu
Not true, you need a tune! Ask a reputable tuner to help you out with that! 
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On my current setup (and two previous ones) I have never seen the idle AFR's dead on consistent. AS in red light to red light they will change..sometimes simply spike to very rich or lean.
All of these builds were tuned by reputable tuner (that everyone on this board is familiar with). His input on this question, which was a concern of mine at one point, was that typically the wide band o2 sensors need more flow past them to see accurate readings.
Believe it or not, I am not trying to argue..I have seen plenty of your posts w/ good info. Hit me with some knowledge!
Another thought, since there is no load on the engine at idle being lean should not produce harmful effect, correct? Thinking about the AFR's some newer 'fuel efficient' vehicles see is part of what I am thinking.