<<Still getting the rougher idle and the occasional erratic idle even after the engine has been run for a while. From what I read does this might eliminate the EGR Valve and EGR tube because the engine is out of the cycle that involves the EGR valve and EGR tube?
Running the engine for a while does not stop the egr system.. it works all the time, when called for..
You are thinking of the AIR system , maybe??