I bought a digital multimeter to check the voltage on my car because I sensed the sluggishness was due to electrical problems. Head gasket, timing belt, water pump, piston rings, and thermostat were all changed earlier this year. With the car off, not running the voltage on the battery is a little over 13 volts, which I think is normal. But when I tested the injectors (touching the positive to battery and the ground to the middle of the injector) they were all different readings. From left to right it was .98, 0.17, 0.04, and 4.36...!? I tested the connectors to the injectors and they were all 13.00, 12.89 on each injector. So I'm left to conclude that maybe my lack of power problem is because of this, but I need a second opinion. I didn't notice any corrosion either. I cant seem to get past 4 or 5k rpms. Getting to 70 is a struggle it seems like for the engine, so I usually go as slow as possible. Any help is appreciated.