2010 Jeep Liberty Sport 4x4

All,
My Liberty keeps throwing a P0300 code (random misfire, multiple cylinders). I have changed the spark plugs and wires with no change.
What are the possible causes?
Need to get this inspected in the next 5 days. Won't pass a New York State inspection with the code.
Any help is greatly appreciated.

Scott

Possibly Coils?
A good scanner can tell you which cylinders are misfiring.

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