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Sounds like you need to adjust the throttle screw on the carb and try to check the timing to see where it's set. With the choke on(when it's cold) it's holding the throttle open for you. Once it warms up and the choke comes off, it's backing down and sounds like the throttle screw is backed out too far.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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