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Check the timing on it along with your plugs and wires.The backfire is from gas not burning completely and ignites in the exhaust.Most likely its the timing which can be set by turning the distrib very very little at a time till prob is solved.

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โˆ™ 2011-09-13 17:26:18
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Q: Why would your 89 Suburban 350 backfire at cold start shake so bad the engine might jump out of frame then after a few minutes get smoother but is sluggish?
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