1998 K1500 5.7 Z71 rough idle/high in park, loss of power/ knocking no

[eliudrodz]

1998 K1500 5.7 Z71 rough idle/high in park, loss of power/ knocking noise, randam misfire, then goes back to normal. Turn it off, back on, and after several minutes it will start sharking and problem starts again. Any ideas? I have been reading previous comments and replaced the Mass Airflow Sensor, fuel pump, wires, rotor, cap, fuel filter, o2 sensors.

[redneck86]

crank shaft position sensor??