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A decent scan tool can show more than codes. Sensors that are almost out of range but not quite enough to trigger the cel. There might be not ready conditions stored as well. You should try to find someone that can plug something in and watch your car run while it's happening. Looking at the O2 readings and fuel trims might help show if it's loading up or leaning out for a brief moment.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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