Toyota Repair: 2000 TOYOTA COROLLA, toyota corolla, dtc

Question
QUESTION: I HAVE A RANDOM MISFIRE ON ALL 4 CYLINDERS REPLACED PLUGS & COILS STILL SAME PROBLEM.

ANSWER: Do you have a p0300 dtc along with another single cylinder code such as p0301-304? Are there any other codes besides the misfires.

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QUESTION:  yes i have codes p0 300 po302 po 303 thank you

Answer
The misfire is located on cylinders number two and three, there are a couple of possibilities, those fuel injectors are not working, there is low compression, the fuel injectors are easy to remove, try swapping the #3 injector with #4 and see if the misfire moves to the #4 cylinder, if so replace both the #2 and #3 injectors. This is not uncommon so I think that will fix the problem.