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The next step is to check compression of the cylinder you need 140 to 180 psi. Check the injector to make sure it is clicking. You need to check the pulse width of the input to the injector 3.0 ms is about normal at idle. I have seen restricted injectors on this engine. You could always swap the injector to another cylinder and see if the misfire follows the cylinder that would confirm before you but an injector. Have you checked for vacuum leaks around the intake?
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The injectors on the drivers side are reasonably easy to swap. This might be an option before buying one. Make sure you have ruled out the compression first. You used quality parts for the coil and wires and plugs?