Re: 2002 Liberty 3.7 misfire code issues
A leaking fuel injector is a good possibility. It would cause the fuel line to drain after shutdown and cause hard starting and could cause a rich mixture at the O2 sensor (especially at idle), causing the PCM to downtrim the injector pulse. It would be a significant leak, so easily to trace. You could take all injectors out and let them clean in an ultrasonic bath and then check the spray pattern and if they are closing properly.