Installed it on a 2004 Chevy Silverado 6.0L with a 4L80E engine. Immediately, my long-term fuel adjustments on both banks were -12.5. (This ECU takes 12.5% fuel from the engine on each side) Engine light on for both banks, running too rich. Took them out and checked for flow and on average they ran 3% more fuel than stock. 3% x 8 = 25% more fuel. Not thrilled, but then I decided to give it a try.
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