Why is my truck misfiring?

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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.

chevr in Roxie MS

Feb 5, 2014

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