rough idle bad milage weak jakes

[Signature620]

How many hours on the engine? Air in fuel and bad fuel pump actuators are common causes of cm2250 rough idle.

Do you have access to INSITE?

Is the oil pressure normal?

Check for other fluids diluting the oil or a leak in the overhead in regards to your engine brake problem. The solenoids can leak when actuated, the valves in the jake levers can break, rocker shafts can come loose, etc. *Weak Engine brake complaints are very very rarely solved by adjusting the overhead* But by all means, adjust it if it's due.