My daughter has a 93 Grand Cherokee limited, 5.2l automatic, with 200k miles. The engine runs fine, smooth and plenty of power till it get to operating temp(205*), then runs rough and acts like the timing is off. I have changed both cam and crank ps', rotor, cap, oil, air and fuel filters, plugs n wires, fuel pump, thermostat and ecu temp sensor, vacuum hoses, pcv valve, alternator and battery. I don't get and codes (12 no codes and 55 end of codes). I am at my wits end! Does anyone have any ideas or had this problem before?