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To test the injectors, you are going to need a digital multimeter. Locate the round plug coming from the intake assembly on the right side of the engine. Unplug it, then test the harness going into the intake. Place your red meter lead on the red wire, then touch the black meter lead on the other 3 wires. Checking the resistance, you should be getting 1.2 Ohms. Do this and let me know what you find out.