New EGR cleaned the throttle body real good still idles up and down and dies when coming to a stop. When its parked facing up hill it wont start at all Im thinking fuel pump or fuel pressure regulator if so where is the Puel pressure regulator located?

 

I would say that’s def something with the fuel system. Either the fuel pump or the regulator like you said. I think there is a way to check the pressure or your fuel lines; I have read a post on it before so I suggest searching the forum. As for a general rough idle I would have suggested a seafoam treatment. My truck idled at over 1,000rpm just sitting there, now it idles at like 500-600rmp...