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

Any misfires accruing? I'd recommend performing a fuel injector balance test.

Just two weeks ago I had an '05 3.5 with P0300 illuminating the MIL and 9000+ misfires in history for cyl. one. Read the TSBs, decided to eliminate fuel injectors before performing... Login to read more.