2002 Dodge Intrepid engine wiring harness

I own a 2002 dodge intrepid recently its starting to stall out while driving usually when I turn to the left it shuts down ten minutes later it starts back up and do the same thing I was told to replace the engine wiring harness my question is what does the harness control on the car more importantly where is it located at on the intrepid no one seems to know please help?