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Oh, id also look at the o2 sensor. That should not allow it to run lean at idle and part throttle but would not help you where your lean at 0-5lbs.
Ill say this too, get a 2nd opinion on the wideband, like run an innovate lm1 in the tailpipe to see if you have different readings. I dont trust aem widebands. I have had many customers with them and my innovate widebands read right with the widebands on dynos while the aem widebands will give different readings.
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