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Re: 2004 Chevy Colorado I-5 3.5L rough idle
Posted to Technical Discussion Forum on 3/4/2009

Hey Donald,

Just had an 05 with 36,500 on the clock, P0300, 256000 misfire count on # 2, rough idle. Swapped coils, then plugs, no difference, Cylinder leak down showed 38% out the intake valve. Customer still had warranty under his lease and brought it back... Login to read more.