There could be multiple problems. Have you checked the spark on cylinders 2 and 5? If so and they are good then the next step would be a compression test. If compression is ok, look for a vacumn leak most likely on the intake manifold next to those clyinders. If thst checks of you will need a niod light to check injector pulse. Next you can try swapping the injectors,ie:#2 to #3 and #5 to #6 and see if miss changes cylinders. If the injectors are hard to get to you may want to just replace them. Another senario is the catalytic converter, although this is not likely since the miss is only on 2 cylinders it is still a possibility.