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I have a 2003 Chevy Blazer, just bought it, after driving it about 30 miles the service engine soon light came on. Its misfire on cylinder #4. Plugs and wires are good. Whats the problem.

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It can be the coil for #4 each cilynder has his own coil also try to check make sure the coil is installed properly it happen to me I replaced spark plugs on my own blazer and service engine light came on #1 cilynder was not working so I did took the coil of again and make sure it was ok try to get back in place and problem fix if still doing then you can swap coils but not wires that connect the coils and see if your code reads different spark plug # if so then is time for a new coil

Posted on Jun 15, 2009

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LINCOLN: 1999-2004 Navigator
2002-2003 Blackwood
2003-2005 Aviator MERCURY: 2003-2004 Marauder
ISSUE: Some 1999-2004 Navigator, 2002-2003 Blackwood, 2003-2005 Aviator, 2003-2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
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SERVICE PROCEDURE FOR VEHICLES WITH RUNS ROUGH/MISFIRE CONDITION:
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