1999 GMC C1500 codes

1999 GMC C1500
300,000 MILES • V8 • 4WD • AUTOMATIC
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AULT
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have rebuilt engine that is giving codes. im gettig misfires on 1 the 3 then another any ideas
Sep 18, 2010 at 6:50 PM
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RASMATAZ
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Random misfires-normally caused by vacuum leaks and bad fuel
Sep 19, 2010 at 7:20 AM