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If it's misfiring on one cylinder, moving a plug /coil should also move the problem. Use that to troubleshoot.
If it's misfiring on all cylinders at the same time, it might be an intake or or O2 related issue. I would check the idle control valve and O2 sensors. I had a blockage at the ICV hose that gave me all cylinder misfire codes recently. These would happen intermittently also, like your problem.
One of the things I did was to put in an ELM327 OBD2 dongle and use Torque app to see what was happening with the air-fuel ratio during misfire. This helped me troubleshoot my ICV blockage.
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