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I thought that if the EGR was leaking it would make it idle rough and barely run. I know I've read this on a lot of different car/truck boards but I've never had an EGR problem so I can't say for sure. I wonder if you could have a burned valve on that 1 cylinder and it isn't sealing as well resulting in the misfire.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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