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It's normal to get a very short lean spike when the engine transitions from closed loop to PE mode. You can make it go away by commanding PE mode to enable sooner but then you will go rich and enter PE mode under some part throttle conditions that don't need that much fueling. I have found the fueling to be more consistent and stable with a short lean spike on transition.
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2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |