Possible Causes
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
INTERMITTENT CONDITION
ASD RELAY OUTPUT CIRCUIT OPEN
EGR AIR FLOW CONTROL VALVE CIRCUIT SHORTED TO GROUND
EGR AIR FLOW CONTROL VALVE CIRCUIT OPEN
EGR AIR FLOW CONTROL VALVE
ENGINE CONTROL MODULE