You cant tell of the injectors are working fine by just looking. They are designed to flow a specific amount of fuel per minute/hour and at a certain pressure. The only way to confirm is to have then flow tested. You could also have a rash of other issues that also affect performance. Fuel pump, fuel filter, ignition, timing, spark plugs, wires and even ECU. It could be as little as having bad gas, or water in the tank. Try and eliminate some of the simple things before swapping out injectors like fuel pump, water in the tank, bad gas, plugs, wires and even timing. A tune up is probably the least expensive option to make sure all the factory settings are good to go.
Have you replaced the fuel filter? Suggest you check the running fuel pressure and also check the fuel pressure regulator function.
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