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2009 Chevrolet Silverado 1500 WT 5.3L Misfire VIN: 2GCEK133X9
truck started misfiring with check engine light flashing.Did compression test and all cylinders are about 175. checked spark:very strong. Scanner showed steady misfire on cyl. 6.tried a running compression test. First test was 75 lb. on cyl. 6,second test ... Trouble codes: P0300 (multiple cyl misfire)
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