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Is the the 4.0L or the 5.0L?
The P1309 is pointing to a fault with the Camfshaft Position Sensor. Inspect the wire harness and connector for any loose, broken or damaged wires. Remove the Camshaft Sensor, and examind the Synchronizer (the shaft the sensor is mounted to). Inside there should be a "half moon" piece of metal. Make sure it is not damaged- very commonly THIS is what breaks and ruins the sensors. If there is damage, both the syncho and the sensor will need to be replaced.