Hello, what Oliva Muñoz tells you is true, be careful in the measurement of tension to the injectors, since they are fed with 12v + in a constant way and the ECU active with mass (-).
If you want to test the negative signal of the ECU, I have a homemade and cheap shape to do it, with a led and a resistance of 1.5 kohm the resistance is weld Negative, then that someone starting the engine and fixes that the LED flashes, if so, then the ECU is sending injection signal.
But look, in my opinion the fault is simpler than it seems, check the spark plugs, if it has what the mechanics flash flash over, which is stripes in the part of the ceramic q is x where they lose current, the spark plug can be in good condition its electrodes and even being new, but when this flahs over appears generates these pulls, with unstable and loss of power, even your consumption of fuel is included This fault appears x spark plugs with incorrect thermal range, engine reheating, engines equipped with LPG-GNV, and also defective cables, I do not know the version of your engine, but if you have an ignition system with high tension cables, I recommend that you also review the resistivity of them, x experience should not pass 10 kohm, try them above all hot, since they generate more problems.
I hope to have helped you someone, you are lucky in your repair.
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