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International Automotive Technicians Network
Re: 97 Lumina 3.1L Code P0300
Posted to Technical Discussion Forum on 5/5/2001

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A tad late but.... I had one that I missed the rocker on. The pushrod was pinched between the rocker and the head casting. At higher RPMs, the misfire would go away. The damn valve was opening just en... Login to read more.