1995 Other Jeep Models 95 Grand Cherokee rough idle with cod

Engine Performance problem
1995 Other Jeep Models V8 Four Wheel Drive Automatic

Hello I recently posted about a miss and hard starting problem, its a 5.2L v8after monitering alittle more its not a miss. More of a rough idle and acts if it wants to die at lights/stop signs also notice at times it wants to die the voltage drops below normal but when accelerating goes back up and stays. New cap and rotor and plugs and wires and still the same.I was able to get 2 codes that I didnt have before they are

32-EGR solenoid circuit -open or short detected in EGR solenoid circuit /EGR system failure required change in fuel/air ratio not detected during diagnostics test.

52-air/fuel at limit-oxygen sensor signal indicates lean air/fuel ratio during engine operation.

where is the EGR solenoid located I could not find it.
If anyone could tell me what I should check or steps I need to take it would be greatly appreciated
thanks