Code 34

From a previous post ecu clicking I checked all my grounds and cleaned them and now the click is gone but the car still has a real bad stumble in the 2-3 k rpm range. I'm at a loss because my mother in law was driving it when the clutch failed and since I changed it now it runs like crap. getting a code 34 and cel constantly. Would this be a symtom of the egr or should I look elsewhere? It falls on its face when you throttle heavy under load. Other than the egr what could cause this code and problem. Been searching and does all sube have a ground wire to the pass side intake that I read about but don't have on this one. After my engine pull for clutch job I'm trying to sort if I could have forgot something.