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What is the code? Do you have the AIR still hooked up to the headers? Were the rear O2's tuned out or do you have sims plugged in? If the tune went too lean you might be getting the P0300 multiple misfire. Do you know what the tuner did(do you have a printout)?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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