From what I've read out of the tech manuals, yes, it will hurt performance, as long as the light is on. The computer stays in fail-safe mode and drives on bare minimums on everything. I notice a huge difference on Accel and Shifting on mine when the light comes on, also the MPG sucks.
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// 1998 GT-Steeda Conversion \\ -- Sold
// Now own 2001 F-150 SuperCrew 5.4L \\
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