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I'm not sure what year your Liberty is but if it's an older one then there is a bulletin on the issue your experiencing.. If you have a labscope then follow this:
Vehicle IssueMIL on P0725 : 18 : ENGINE SPEED SENSOR CIRCUIT,and or P1391 : 9D : INTERMITTENT LOSS OF CMP OR CKP:CKP circuit.;If after performing powertrain test there is no problem found.
System or ComponentDTC / Error Message;Yes - Intermittent
RecommendationUsing a LAB scope check both CAM and CKP sensor signals, Load or voltage test the Both circuits if all good try good CKP sensor.
Modification Date08/07/03 1:18 PM
Did you use a OEM crankshaft sensor?