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good afternoon my name is ***** ***** I will assist
why did you replace the egr valve??? did you dis connect it and test drive and the surging was gone??? did it show a code for the egr???
first, I would completely clean the throttle body of all carob. that will effect the idle system. the idle air control motor is a control for the idle. the commands come from the pcm. I would remove the motor and clean all passages of carbon as well. there is also a base dile setting with the idle air control in the sealed position that needs to be checked.
do you have a scan tool?? not a code reader but a real scan tool???
ok, start with what I suggested