fault codes 2006 cummins 435 isx

I have replaced the the gas exhaust pressure twice yet it’s throwing the same fault code and my rpms stay 9 then drop down to 6 to 6.5 when ever it wants any suggestions

 

I have replaced the exhaust gas pressure twice code went away the first time then came back replaced it again and has not gone away have and my rpms will sit at 900 while idling I’m the morning I have noticed that rpms return to normal but once I park for the day and I let my truck sit and idle for a bit before shutting off the rpms will shoot Up again

 

Carlos, did you get it fixed?

 

I’m having same issue ..I replaced the sensor ,cleaned out the tube & it goes away & then come back after a few hours of driving ..Has anyone figured this out ?