Engine running lean on one side.

[Adger Smith]

Switch the leads and the sensors. Verify it isn't the way you are reading it. Like Rich said.... Pull the plugs and verify it is lean. If you went up that many jets the reading should have changed. I would say something in the data system is subject if the plugs look ok. If it is reading correctly and still showing lean then there might be a fuel supply problem. Increasing 6 jets if a fair amount of change.