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2008 Chevrolet Silverado 1500 Question: what to do next I changed the sparkplug and the ignition coil, still misfires.

 

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loup, 5.3L V8, Hamden, CT, June 26, 2013, 19:56
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I am getting a "service stabilizer; service traction control" message so I thought a sensor was loose...I checked and couldn't see anything, diagnostics gives a p0306 code. Misfire 6 cylinder...sparkplug totally fouled and caked...still misfire, connect a new ignition coil...still misfires...what to do next?

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