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You're probably running really rich if you haven't had a tune yet. I have a Predator programmer that can watch the sensors. If your fuel trims get off too far, I think the computer goes into limp mode and that might be what's happening. I won't be around today but I might be available Sunday if you wanted to scan it. Did you leave the EGR and AIR hooked up when you did the headers? Do you have any codes showing?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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