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2002 Dodge Ram 1500 Question: Why is my truck misfiring?

 

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chevr, 3.7L V6, Roxie, MS, February 05, 2014, 15:26
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My truck is misfiring on cylinders 3 and 4. The spark plugs are brand new. The only codes that pop up are codes po133 and po138. These are both only o2 sensor codes. Whats causing this misfire? Its really bad. It shakes the whole truck at idle and the truck doesnt want to go.

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    G. T. Service Center (4085 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG February 05, 2014, 15:38
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     Master

    It's not just spark plugs that cause a misfire. Everything that happens in a cylinder during all four cycles can cause a misfire, coil, compression, fuel injection, valves seating, carbon build up. Needs to be diagnosed further.

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