Question about Chevrolet Silverado

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Hello when i crank my truck up it will sputter then while i'm driving at speeds of 20 to 35 mph it starts to backfire with a little lose of power. after i've put 3 different carbs , figuring that was the problem . no with a quadrajet on it it runs a lil better but still backfires

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Backfiring is a timing problem. It happens when one of the cylinders fires while one of the valves is still open. Your timing should advance as the rpm's increase. Carburated vehicle have what's called vaccum advance and if that vaccum advance line is disconnected it will cause what you describe. There should be a vaccum line that connects from the carb to the distributor that controls your vaccum advance. The sputtering at idle is also probably a symptom of a disconnected vaccum line.

Posted on Dec 29, 2010

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Posted on Jan 02, 2017

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