It could be an injector too, I suppose. If nothing else (like a bad O2 sensor or an exhaust leak before the O2 sensor) shows up. Dirty fuel injectors can cause this problem too, as can problems in the fuel lines, vacuum leaks and so on.
I honestly doubt it's the tune. Bill has tuned our model year trucks for too long for something like this to show up now. I just can't see him getting the A/F mixture wrong like that.
- Jack
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