my niece has a 1.8l toyota corolla and its showing a cylinder 1 misfire(301)code on 1999 Toyota Corolla

what does this mean? it has individual coils on each cylinder and i replaced the plugs. could the coil be bad? any suggestions?

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3 answers
You need to get the firing order to pin point the issue to a certain plug, but good rule of thumb is change the wires when you change the plugs. If this doesnt work change the coil.
GET DIAG AND EST AS TO WHAT IT IS,IT COULD BE MANY ISSUES
Swap the coil from #1 to #3 and see if the misfire follows the coil ,if it does , then replace the bad coil.