Toyota Repair: 91 toyota 4runner miss fire, toyota 4runner, miss fire

Question
91 4runner 3L cylindes 3+4 miss firing plugs + wires ok

Answer
In that case the engine compression should be tested next, it's apossibility that the cylinders are losing compression due to leaking valves ot cylinders, another possibility is that the injectors on those cylinders are not working, I would recommend having the compression tested before doing anything else.