I just got an 03 Intrepid SXT, 3.5 HO (my 3rd Intrepid). It hitches under load, particularly when cold. I changed the plugs, but they were clean, and had good color so I know the ignition is ok. I'm thinking maybe vacuum line, or bad connection somewhere as the cruise randomly shuts itself off as well (the cruise light stays on, but it's like it shuts itself off). Any ideas ? I checked the fault codes and they show as P0132, O2 sensor shorted, P0300 multi cylinder misfire, and P0456 small evap system leak. I'm not too familiar with any of this, so any help would be appreciated.