I have my oil tested each change and recently I've had a spike in copper and iron wear products. The test lab suggested its wear on a steel/bronze interface. The truck has been running funny so maybe it's related. What do people have for ideas as far as what areas I should look at.

I don't know what items in the engine contain copper. I didn't think main bearings are copper, but is anything up in the valve train that contains copper?

 

Main,rod, or cam bearing somewhere they contain all of the above materials.