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    Bogged down and backfiring until "warm"

    I have a 96 c1500 5 speed 4.3. The issue I am having is at start it fires up and idles fine. When I start driving it, it feels a little bogged down and under heavy load(hills) will back fire. But at a point in time it will all of sudden clear up and run great. Until I shut it off and even if...
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