multiple random misfire. 99 honda accord 3.0L

[Benjamin]

My 99 accord v6 is misfiring on all cylinders according to the trouble codes. I have changed the spark plugs, ignition wires, distributor cap and rotor, and have installed new fuel injectors on cylinders 4,5,6. i only did that side because i had misfire on cylinder 5 and 6 that would not go away.the after i had changed those injectors then all of the cylinder started misfiring. i did do a pressure test on all cylinders and they all ranged between 120 and 130. We checked for vacuum leaks and replaced the intake manifold gasket and valve cover gaskets. i am the second owner of the vehicle and ive brought it along way from what the first owneer had it at. the car has 278,645 miles on it. and i want it to last longer.i am out of ideas and need help. please and thankyou

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[college man]

Check that the injectors are seated right and the o ring did not roll or crack.

[Benjamin]

its not only cylinder 4-6 misfiring its also 1-3 misfiring as well. literally they are all misfiring. it hesitates and has lack of power when accelerating.

[Author]

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