It's time to find the ECU (engine control unit) it controls the trigger and duration of the injector signal. If you closely evamine the wiring on the injestors you will note a common colour (ie black) and the other may also be black but will have a trace colour on the wire ie black with a thin red / green/ blue etc (TWO COLOUR) stripe to identify its unique signal from ECU. You can chec the output trigger/signal from the ECU to your problen injectors ,, NO signal = No injector opening , change ECU Good luck
What engine do you have? the 3.1 the injectors are all wired togther, so take a test light and check the plugs on all of your inj. use a separate ground to check the hot wires, then use a positive connection to check the ground wires. if you have power to all, it is probably the inj., the 2.0 is the same, the 2.2 or 2.4 may have a different inj system, but you can check the wires the same way. the different system works off of a cam sensor, but if it didnt work no inj would work at all. it then feeds into the ecm (car computer). but i bet its either a wire issue or a couple of bad inj.
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