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Did you swap the MAF for that run? It sounds like a vacuum leak with the fuel trims jumping around that much. Your EGR might be stuck open causing the extra air to get in leaning it out (and causing spark retard). I think it will add fuel until it hits a limit (25% I think). Do you hear any type of hissing or whistling like a vacuum leak?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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