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Have you made sure that every cylinder is firing? You may be running on 5 cylinders, the engine will still idle fine,.In this condition a Wide Band o2 will register lean, and if you have made EFI adjustments to compensate then all the other cylinders will be running too rich. You would get extra flames and an overheated exhaust from too much fuel burning in the pipes, you would still generate full boost but you would lose most of your power.
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David
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