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Do you have good spark at the cylinder?Is this the 2.0 engine?
Is the misfire constant or dose it come and go?
The cylinder should fire okay at 120 PSI, if you are sure you have good spark and the compression checks okay then the next steps would be to try swapping the #1 injector with the #2 and see if the misfire moves. If it dose then your dealing with a bad injector. The 2.5 has had some issue with failing injectors as well. Before you do anything else, try swapping the injectors.
You can check the resistance with an Ohm meter at the injector, it should be right at 12 to 16 ohms. That being said its not always a good test if the injector is restricted. You can also take a standard 12 volt test light and at the injector connector (pluged in) place the test end of the light on one wire and the ground in on the other wire and start the engine. If you have injector pulse the test light should flash.