Question about 2004 Chevrolet TrailBlazer

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I have a 2004 Trailblazer EXT 4.2 S6 that started misfiring about a week ago and I've replaced all 6 plugs and the coil but its still throwing a code for cylinder #3 misfire. Checked the compression out and it was fine but when I checked for voltage on the wires that connects to the coils, cylinder #3 only receives 12 volts while the other 5 are receiving 14 volts. How can I solve this problem so it will fire properly and I can get my horsepower back?

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Thoroughly check the wires leading to the coil for damage or corrosion.

Posted on Mar 12, 2011

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