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Ok just had new injection pump put on at shop runs fine at high rpm but at low rpm fuel pressure is all over the place does anyone know what it would be....
And also my 4x4 light is flashing and it will not switch in to 4x4 they did lift body off
 

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Ok, this is standard spring and diaphragm regulator diagnosis, there may be other factors in the fuel delivery system playing into this.

1) Weakening spring and/or failing diaphragm.
2) Internal fouling. Corrosion products/ contaminants can foul the seat preventing proper flow on low demand or restrict movement of the stem.
3) Regulator is improperly sized for the application.

Once again, that's prognosis for any generic pressure regulator. As far as the 4X4, did you check to see if everything got hooked back up and not pinched?
 
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